Core System Architecture Part 122 — Anonymous Network Architecture Governance, Technical Standards, ADR Lifecycle, Design Review, Exception Management & Privacy-Preserving Engineering Decision Architecture

SIAR — Secure, Local-First, Multi-Transport Communication Platform

Series: Core System Architecture
Part: 122
Status: Architecture specification
Primary language: Rust
Builds on: Core System Architecture Parts 53, 61–69, 73, 94–108, 120–121

Primary purpose: define SIAR's architecture-governance system for technical principles, standards, ADRs, design review, exception/waiver management, compatibility policy, deprecation, technical authority, policy enforcement, evidence, review freshness, and privacy-preserving engineering decision-making.

1. Purpose

Large systems degrade when architecture decisions become:

implicit
inconsistent
undocumented
person-dependent
unreviewed
irreversible

A mature platform must answer:

Which technical standards are mandatory?
Who can approve exceptions?
Why was a design chosen?
Which decisions are still valid?
Which standards are being deprecated?
How do changes prove architectural compliance?
How do we prevent governance from becoming bureaucracy or people scoring?

The governing principle is:

SIAR architecture governance should make technical decisions explicit, versioned, evidence-backed, reviewable, and enforceable while keeping authority scoped and avoiding developer surveillance or personality-based decision making.

2. Architectural Position

          ENGINEERING PRINCIPLES
                   │
                   ▼
          TECHNICAL STANDARDS
                   │
        ┌──────────┼──────────┐
        │          │          │
      ADRs      DESIGN     EXCEPTIONS
        │        REVIEW        │
        └──────────┼──────────┘
                   ▼
          GOVERNED DECISION
                   │
                   ▼
       CI / CHANGE / RELEASE GATES
                   │
                   ▼
       REVIEW / DEPRECATE / REPLACE

3. Core Separation

Keep distinct:

principle
standard
guideline
ADR
design review
exception
waiver
deprecation
implementation detail

4. Non-Goals

Part 122 does not create:

developer rankings
architecture-by-popularity
unbounded review committees
per-person exception history for performance management
ad hoc executive override of hard invariants

5. Architecture Principle

High-level invariant-oriented rule.

#![allow(unused)]
fn main() {
pub struct ArchitecturePrinciple {
    pub id: ArchitecturePrincipleId,
    pub title: String,
    pub statement: PrincipleStatement,
    pub class: PrincipleClass,
}
}

6. Principle Class

#![allow(unused)]
fn main() {
pub enum PrincipleClass {
    Security,
    Privacy,
    Reliability,
    LocalFirst,
    Interoperability,
    Maintainability,
    Performance,
    Operability,
}
}

7. Hard Rule

Principles are not implementation recipes.

8. Example Principles

no silent privacy downgrade
persist before send
hard bounds on queues
typed identity domains
JSON only for external interop when necessary
Postcard for internal binary wire
RON for human-owned configuration

9. Technical Standard

A concrete enforceable engineering rule.

#![allow(unused)]
fn main() {
pub struct TechnicalStandard {
    pub id: TechnicalStandardId,
    pub title: String,
    pub scope: StandardScope,
    pub state: TechnicalStandardState,
    pub version: TechnicalStandardVersion,
}
}

10. Standard Scope

#![allow(unused)]
fn main() {
pub enum StandardScope {
    Platform,
    ServiceClass(ServiceClassId),
    CrateClass(CrateClassId),
    Protocol(ProtocolId),
    Runtime(RuntimeClass),
    DeploymentClass(DeploymentClass),
}
}

11. No Person Scope

Hard rule.

12. Standard State

#![allow(unused)]
fn main() {
pub enum TechnicalStandardState {
    Draft,
    Proposed,
    Active,
    Deprecated,
    Retired,
}
}

13. No Draft→Retired Direct

Hard rule.

14. Standard Strength

#![allow(unused)]
fn main() {
pub enum StandardStrength {
    Mandatory,
    RequiredUnlessException,
    Recommended,
    Informational,
}
}

15. Mandatory

No exception if tied to hard invariant.

16. RequiredUnlessException

Scoped waiver possible.

17. Recommended

Strong default.

18. Informational

Knowledge/reference only.

19. Hard rule.

20. Standard Registry

Canonical source of truth.

#![allow(unused)]
fn main() {
pub struct TechnicalStandardsRegistry {
    pub version: StandardsRegistryVersion,
    pub standards: BTreeMap<TechnicalStandardId, TechnicalStandard>,
}
}

21. Signed / Versioned

Hard rule.

22. No Wiki-Only Standard

Hard rule.

23. Standard Evidence

Each standard should include:

motivation
security/privacy impact
compatibility impact
migration impact
testing requirement

24. Hard rule.

25. Architecture Decision Record

ADR captures a durable design decision.

#![allow(unused)]
fn main() {
pub struct ArchitectureDecisionRecord {
    pub id: AdrId,
    pub title: String,
    pub status: AdrStatus,
    pub scope: AdrScope,
    pub decision: DecisionStatement,
}
}

26. ADR Status

#![allow(unused)]
fn main() {
pub enum AdrStatus {
    Draft,
    Proposed,
    Accepted,
    Superseded,
    Deprecated,
    Rejected,
}
}

27. No Accepted→Draft

Hard rule.

28. ADR Scope

#![allow(unused)]
fn main() {
pub enum AdrScope {
    Platform,
    Service(ServiceId),
    Protocol(ProtocolId),
    Crate(CrateId),
    Deployment(DeploymentClass),
}
}

29. ADR Contents

Required:

context
decision
alternatives
consequences
invariants
migration
rollback/exit strategy where relevant

30. Hard rule.

31. ADR Context

Factual constraints.

32. ADR Alternatives

Include credible alternatives considered.

33. No Strawman Alternatives

Hard rule.

34. ADR Consequences

Both positive and negative.

35. Hard rule.

36. ADR Invariants

Reference relevant technical standards/hard invariants.

37. Hard rule.

38. ADR Supersession

New ADR explicitly supersedes old ADR.

#![allow(unused)]
fn main() {
pub struct AdrSupersession {
    pub old: AdrId,
    pub new: AdrId,
    pub effective_at: Timestamp,
}
}

39. Historical ADRs Immutable

Hard rule.

40. Design Review

Design review validates architecture before high-impact implementation.

41. Review Trigger

#![allow(unused)]
fn main() {
pub enum DesignReviewTrigger {
    NewProtocol,
    NewPersistentStore,
    NewTrustBoundary,
    NewExternalDependency,
    NewCryptoUsage,
    NewCrossRegionFlow,
    NewPluginBoundary,
    HighRiskMigration,
    PlatformWideChange,
}
}

42. Hard rule.

43. Design Review Record

#![allow(unused)]
fn main() {
pub struct DesignReview {
    pub id: DesignReviewId,
    pub trigger: DesignReviewTrigger,
    pub scope: AdrScope,
    pub state: DesignReviewState,
}
}

44. Review State

#![allow(unused)]
fn main() {
pub enum DesignReviewState {
    Requested,
    InReview,
    ChangesRequired,
    Approved,
    Rejected,
    Expired,
}
}

45. Approved Requires Evidence

Hard rule.

46. Design Review Evidence

#![allow(unused)]
fn main() {
pub struct DesignReviewEvidence {
    pub architecture_doc: DocumentRef,
    pub threat_model: Option<DocumentRef>,
    pub test_plan: Option<DocumentRef>,
    pub migration_plan: Option<DocumentRef>,
    pub rollback_plan: Option<DocumentRef>,
}
}

47. Required By Trigger

Hard rule.

48. Review Dimensions

#![allow(unused)]
fn main() {
pub enum DesignReviewDimension {
    Security,
    Privacy,
    Reliability,
    DataIntegrity,
    Performance,
    Maintainability,
    Operability,
    Compatibility,
    Migration,
}
}

49. No Single "Good Design" Score

Hard rule.

50. Review Finding

#![allow(unused)]
fn main() {
pub struct DesignReviewFinding {
    pub dimension: DesignReviewDimension,
    pub severity: FindingSeverity,
    pub statement: FindingStatement,
    pub evidence: Vec<EvidenceRef>,
}
}

51. Finding Severity

#![allow(unused)]
fn main() {
pub enum FindingSeverity {
    Advisory,
    Required,
    Blocking,
}
}

52. Blocking

Must resolve or explicitly reject design.

53. Hard rule.

54. Review Authority

Scoped.

#![allow(unused)]
fn main() {
pub enum ArchitectureReviewAuthority {
    PlatformArchitecture,
    SecurityArchitecture,
    PrivacyArchitecture,
    DataArchitecture,
    ServiceArchitecture(ServiceId),
}
}

55. No Universal Architect Superuser

Hard rule.

56. Separation Of Duties

High-risk review may require multiple authorities.

57. Example

crypto design:
platform + security

58. Hard rule.

59. Exception Management

Some standards permit exceptions.

60. Exception Record

#![allow(unused)]
fn main() {
pub struct ArchitectureException {
    pub id: ArchitectureExceptionId,
    pub standard: TechnicalStandardId,
    pub scope: StandardScope,
    pub rationale: ExceptionRationale,
    pub expires_at: Timestamp,
}
}

61. Exceptions Are Time-Bounded

Hard rule.

62. Exception Preconditions

standard allows exception
scope narrow
reason documented
compensating controls defined
expiry set

63. Hard rule.

64. Hard-Invariant Standards

No waiver.

65. Examples:

tenant isolation
signature verification
encryption requirement
no silent anonymity downgrade

66. Hard rule.

67. Exception State

#![allow(unused)]
fn main() {
pub enum ArchitectureExceptionState {
    Requested,
    Approved,
    Active,
    Expired,
    Revoked,
    Closed,
}
}

68. Expired Exception

No longer authorizes deviation.

69. Hard rule.

70. Compensating Controls

#![allow(unused)]
fn main() {
pub struct ArchitectureCompensatingControl {
    pub control: ControlId,
    pub purpose: String,
}
}

71. Hard rule.

72. Waiver vs Exception

Use one canonical model internally.

Avoid semantic duplicates.

73. Hard rule.

74. Exception Renewal

Requires fresh review.

75. No automatic perpetual renewal.

76. Hard rule.

77. Exception Ownership

Prefer service/team ownership.

78. Not individual developer ownership.

79. Hard rule.

80. Standards Compliance

Check:

code
config
protocol
deployment
dependency

81. Compliance State

#![allow(unused)]
fn main() {
pub enum ArchitectureComplianceState {
    Compliant,
    ExceptionActive,
    NonCompliant,
    Unknown,
}
}

82. Unknown ≠ Compliant

Hard rule.

83. Static Enforcement

Where possible, encode standards into:

Rust types
clippy/lints
schemas
CI checks
policy DSL
dependency policy

84. Strong Preference

Machine-enforce what can be machine-enforced.

85. Hard rule.

86. Human Review

Reserved for:

tradeoffs
new boundaries
novel architecture
risk acceptance

87. Hard rule.

88. Architecture Linter

#![allow(unused)]
fn main() {
pub trait ArchitectureLintService {
    fn evaluate(
        &self,
        artifact: ArtifactRef,
    ) -> Result<Vec<ArchitectureViolation>, ArchitectureGovernanceError>;
}
}

89. Violation

#![allow(unused)]
fn main() {
pub struct ArchitectureViolation {
    pub standard: TechnicalStandardId,
    pub severity: FindingSeverity,
    pub evidence: Vec<EvidenceRef>,
}
}

90. Hard rule.

91. CI Integration

CI may enforce:

dependency restrictions
serialization rules
unsafe-code policy
feature flags
crate layering
protocol schema rules

92. Hard rule.

93. Workspace Governance

Rust workspace layer rules.

Example:

domain crates cannot depend on UI
protocol crates cannot depend on database adapters
security policy crate cannot depend on application shell

94. Hard rule.

95. Dependency Governance

Allowed licenses/security/status.

96. Part 73/98 integration.

97. Hard rule.

98. Unsafe Rust Governance

If used:

scoped
documented
reviewed
tested
justified

99. Hard rule.

100. Cryptography Governance

No custom crypto.

Use reviewed libraries/protocols.

101. Hard rule.

102. Protocol Governance

Versioning, compatibility, migration, anti-rollback.

103. Part 52/99.

104. Hard rule.

105. Data Model Governance

Persistent schema changes require:

migration
rollback/forward plan
compatibility check

106. Hard rule.

107. API Governance

Stable boundary.

108. Breaking changes explicit.

109. Hard rule.

110. Compatibility Policy

#![allow(unused)]
fn main() {
pub enum CompatibilityPolicy {
    BackwardCompatible,
    ForwardCompatible,
    DualReadDualWrite,
    ExplicitBreak,
}
}

111. Hard rule.

112. Deprecation

#![allow(unused)]
fn main() {
pub struct DeprecationPolicy {
    pub deprecated_at: Timestamp,
    pub removal_not_before: Timestamp,
    pub replacement: Option<TechnicalStandardId>,
}
}

113. No Instant Removal For Stable Public Interfaces Without Emergency

Hard rule.

114. Emergency Deprecation

Security issue can accelerate removal.

115. Still documented/versioned.

116. Hard rule.

117. Standard Evolution

State machine:

Draft
→ Proposed
→ Active
→ Deprecated
→ Retired

118. Hard rule.

119. Standard Review Cadence

#![allow(unused)]
fn main() {
pub enum StandardReviewCadence {
    Quarterly,
    SemiAnnual,
    Annual,
    EventDriven,
}
}

120. Hard rule.

121. Standard Freshness

#![allow(unused)]
fn main() {
pub enum StandardFreshness {
    Fresh,
    DueSoon,
    Stale,
}
}

122. Stale Standard Requires Review

Hard rule.

123. Review Trigger Events

Examples:

incident
new platform
security change
dependency change
protocol change

124. Hard rule.

125. ADR Freshness

Accepted ADR may become stale if assumptions change.

126. Freshness does not mutate historical decision.

127. Instead create review/supersession.

128. Hard rule.

129. Design Drift

Implementation may diverge from approved design.

130. Drift Detection

Part 105/106.

131. Hard rule.

132. Architecture Drift Finding

#![allow(unused)]
fn main() {
pub struct ArchitectureDrift {
    pub scope: AdrScope,
    pub expected: ArchitectureBaselineRef,
    pub observed: ArchitectureObservationRef,
}
}

133. Hard rule.

134. Exception Debt

Exceptions themselves can become technical debt.

135. Part 121 integration.

136. Hard rule.

137. Exception Risk Link

#![allow(unused)]
fn main() {
pub struct ExceptionRiskLink {
    pub exception: ArchitectureExceptionId,
    pub risk: EngineeringRiskId,
}
}

138. Good.

139. Architecture Review & Risk

Part 121.

Design review must surface:

known risks
accepted debt
systemic weakness

140. Hard rule.

141. PIR Integration

Part 120.

Incident lesson may:

create standard
tighten standard
supersede ADR
remove exception

142. Hard rule.

143. Change Integration

Part 107.

High-impact change references:

ADR
design review
exceptions
standards

144. Hard rule.

145. Release Integration

Part 108.

Release certification checks architecture compliance.

146. Hard rule.

147. SLO Integration

Part 109.

Architecture decision should state reliability effect where material.

148. Hard rule.

149. Resilience Integration

Part 110.

Topology decisions should reference fault-domain assumptions.

150. Hard rule.

151. Capacity/Performance Integration

Parts 111–113.

Resource tradeoffs documented.

152. Hard rule.

153. Geographic Governance

Part 103.

Architecture decision cannot override residency constraints.

154. Hard rule.

155. Organizational Governance

Part 104.

Decision authority scoped.

156. No manager title automatically grants technical override.

157. Hard rule.

158. Audit Integration

Part 94.

Audit:

standard activated
ADR accepted
exception approved
exception revoked
design review approved

159. Not every comment.

160. Hard rule.

161. Compliance Integration

Part 95.

Standards can map to controls.

162. Hard rule.

163. Security Operations Integration

Part 97/98.

Security standards feed vulnerability/remediation process.

164. Hard rule.

165. Supply Chain Integration

Part 73.

Dependency standards enforce:

SBOM
provenance
license
security posture

166. Hard rule.

167. Architecture Decision Evidence

Minimum:

context
constraints
alternatives
decision
consequences

168. High-Risk Evidence

Additionally:

threat model
migration plan
rollback/exit plan
test strategy
operational impact

169. Hard rule.

170. Decision Reversibility

Classify.

#![allow(unused)]
fn main() {
pub enum DecisionReversibility {
    Easy,
    Moderate,
    Difficult,
    PracticallyIrreversible,
}
}

171. Hard rule.

172. Review Depth

Greater for less reversible decisions.

173. Hard rule.

174. Decision Blast Radius

#![allow(unused)]
fn main() {
pub enum DecisionBlastRadius {
    Local,
    Service,
    MultiService,
    Platform,
}
}

175. Hard rule.

176. Decision Review Matrix

Use:

blast radius
reversibility
security/privacy effect
data migration
external compatibility

177. No People-Based Review Depth

Hard rule.

178. Architecture Decision Authority

#![allow(unused)]
fn main() {
pub struct DecisionAuthority {
    pub scope: AdrScope,
    pub authority: ArchitectureReviewAuthority,
    pub decision_classes: BTreeSet<DecisionClass>,
}
}

179. Hard rule.

180. Decision Class

#![allow(unused)]
fn main() {
pub enum DecisionClass {
    LocalImplementation,
    ServiceArchitecture,
    SharedPlatform,
    SecurityBoundary,
    Protocol,
    PersistentData,
    ExternalInterface,
}
}

181. Local Implementation

May not require ADR.

182. Hard rule.

183. Escalation

Escalate only when scope/risk crosses threshold.

184. Avoid review bottleneck.

185. Hard rule.

186. Architecture Forum

Optional coordination mechanism.

187. Artifact remains canonical.

188. Hard rule.

189. Decision Meeting Notes

Not authoritative unless reflected in ADR/review record.

190. Hard rule.

191. Voting

Not baseline.

Architecture is not popularity contest.

192. Hard rule.

193. Decision Conflict

If authorities disagree:

document disagreement
identify hard constraints
escalate to scoped governance body

194. No hidden override.

195. Hard rule.

196. Architecture Exception Authority

#![allow(unused)]
fn main() {
pub struct ExceptionAuthority {
    pub standard: TechnicalStandardId,
    pub approvers: BTreeSet<ArchitectureReviewAuthority>,
}
}

197. Hard rule.

198. Exception Expiry Alert

Before expiration.

199. Hard rule.

200. Expired Exception Enforcement

CI/release gate fails where enforceable.

201. Hard rule.

202. Architecture Baseline

Snapshot of active standards and accepted ADRs.

#![allow(unused)]
fn main() {
pub struct ArchitectureBaseline {
    pub version: ArchitectureBaselineVersion,
    pub standards: BTreeSet<TechnicalStandardId>,
    pub adrs: BTreeSet<AdrId>,
}
}

203. Hard rule.

204. Baseline Pinning

Release records baseline version.

205. Good.

206. Hard rule.

207. Architecture Compliance Report

#![allow(unused)]
fn main() {
pub struct ArchitectureComplianceReport {
    pub scope: AdrScope,
    pub baseline: ArchitectureBaselineVersion,
    pub state: ArchitectureComplianceState,
    pub violations: Vec<ArchitectureViolation>,
    pub exceptions: Vec<ArchitectureExceptionId>,
}
}

208. Hard rule.

209. No One Architecture Score

Hard rule.

210. Architecture Governance Dashboard

Show:

active standards
stale standards
open design reviews
active exceptions
expiring exceptions
architecture drift

211. Forbidden:

developer exception count
engineer design rejection ranking

212. Hard rule.

213. Privacy-Preserving Governance

Governance evidence contains:

technical scope
decision
risk
standard

Not:

behavioral employee profile
private user content

214. Hard rule.

215. Person Identity Minimization

Decision records may require approver identity for accountability.

216. But not used for performance analytics.

217. Hard rule.

218. Architecture Review Retention

Long-term for durable decisions.

219. Comments/drafts may have shorter retention.

220. Hard rule.

221. Standard Authoring Format

Preferred:

Markdown source
RON machine-readable policy metadata
Postcard compiled runtime policy
JSON only for external tooling when necessary

222. Hard rule.

223. Deterministic Policy Compilation

Human-readable standard → machine-enforceable policy.

224. Hard rule.

225. Policy Compiler

#![allow(unused)]
fn main() {
pub trait ArchitecturePolicyCompiler {
    fn compile(
        &self,
        registry: &TechnicalStandardsRegistry,
    ) -> Result<CompiledArchitecturePolicy, ArchitectureGovernanceError>;
}
}

226. Hard rule.

227. Architecture Registry Service

#![allow(unused)]
fn main() {
pub trait ArchitectureRegistryService {
    fn standard(
        &self,
        id: TechnicalStandardId,
    ) -> Result<TechnicalStandard, ArchitectureGovernanceError>;

    fn adr(
        &self,
        id: AdrId,
    ) -> Result<ArchitectureDecisionRecord, ArchitectureGovernanceError>;
}
}

228. Design Review Service

#![allow(unused)]
fn main() {
pub trait DesignReviewService {
    fn request(
        &self,
        review: DesignReview,
    ) -> Result<DesignReviewId, ArchitectureGovernanceError>;

    fn approve(
        &self,
        id: DesignReviewId,
        evidence: DesignReviewEvidence,
    ) -> Result<DesignReviewReceipt, ArchitectureGovernanceError>;
}
}

229. Exception Service

#![allow(unused)]
fn main() {
pub trait ArchitectureExceptionService {
    fn request(
        &self,
        exception: ArchitectureException,
    ) -> Result<ArchitectureExceptionId, ArchitectureGovernanceError>;

    fn active_for(
        &self,
        standard: TechnicalStandardId,
        scope: StandardScope,
    ) -> Result<Vec<ArchitectureException>, ArchitectureGovernanceError>;
}
}

230. No Generic Architecture Override API

Hard rule.

231. Error Taxonomy

#![allow(unused)]
fn main() {
pub enum ArchitectureGovernanceError {
    StandardUnknown,
    AdrUnknown,
    ReviewRequired,
    ReviewExpired,
    BlockingFinding,
    ExceptionNotAllowed,
    ExceptionExpired,
    HardInvariantViolation,
    BaselineMismatch,
    DriftDetected,
    ScopeViolation,
    Unauthorized,
    Internal,
}
}

232. Observability

Safe metrics:

standards by state
stale standards
open reviews
active exceptions
expiring exceptions
drift findings

233. Forbidden:

developer rejection rate
exceptions per engineer
reviewer speed leaderboard

234. Hard rule.

235. Architecture Governance SLOs

Examples:

critical standards reviewed on cadence
high-risk design review completed before implementation
exceptions renewed/revoked before expiry
architecture drift triaged within target

236. Security SLO

0 hard-invariant standards waived
0 expired exception accepted by release gate
0 high-risk crypto design merged without required review

237. Privacy SLO

0 architecture governance employee scoring
0 private user content in ADR/design-review evidence by default

238. Failure Modes

standards become stale
exceptions never expire
architecture review becomes bottleneck
implementation diverges from decision

239. Stale Standards

Trigger review.

240. Hard rule.

241. Permanent Exceptions

Schema/policy rejects.

242. Hard rule.

243. Review Bottleneck

Use trigger thresholds and delegated scoped authority.

244. Hard rule.

245. Decision Drift

Detect via code/config/dependency inspection.

246. Hard rule.

247. Testing

Need architecture-governance testkit.

248. Test Scenarios

new protocol
new DB
security-sensitive crate
temporary exception
ADR supersession

249. Standard State Test

Invalid transitions rejected.

250. Exception Test

Mandatory non-waivable standard cannot be waived.

251. Expiry Test

Expired exception no longer authorizes.

252. ADR Test

Historical ADR preserved after supersession.

253. Design Review Test

Blocking finding prevents approval.

254. Baseline Test

Release records exact architecture baseline.

255. Drift Test

Observed implementation mismatch surfaced.

256. Dependency Test

Forbidden crate dependency rejected in CI.

257. Privacy Test

No person-based governance aggregation.

258. Review Scope Test

Local implementation change does not require platform review unnecessarily.

259. Fuzzing

Fuzz:

standard lifecycle
ADR lifecycle
exception records
review findings
baseline compilation

260. Property Tests

Properties:

non-waivable standard can never receive active exception
expired exception can never produce Compliant state
accepted ADR can never be mutated retroactively
person identity can never become architecture-compliance aggregation dimension

261. Formal Verification Targets

Strong candidates:

standard lifecycle
exception expiry
ADR supersession
baseline compilation

262. Kani Candidate

state/expiry/non-waiver invariants.

263. TLA+ Candidate

draft standard → active → exception → expiry → compliance enforcement.

264. Loom Candidate

concurrent exception expiry + release gate + policy refresh.

265. Performance

Governance checks should be cheap in CI.

266. Heavy design review remains offline.

267. Hard rule.

268. Storage

Separate:

principles
standards registry
ADR records
design reviews
review findings
exceptions
baselines
compliance reports

269. No workforce performance warehouse.

270. Hard rule.

271. Partitioning

By:

platform
service
protocol
crate
deployment
standard class

272. No person/user partition.

273. Hard rule.

274. Crate Layout

Recommended:

crates/
├── siar-architecture-core/
├── siar-standards-registry/
├── siar-adr/
├── siar-design-review/
├── siar-architecture-exceptions/
├── siar-architecture-lint/
├── siar-architecture-baseline/
├── siar-architecture-drift/
├── siar-architecture-observability/
└── siar-architecture-testkit/

275. siar-architecture-core

Owns:

ArchitecturePrincipleId
TechnicalStandardId
AdrId
ArchitectureGovernanceError

276. siar-standards-registry

Standards lifecycle/versioning/strength/scope.

277. siar-adr

ADR lifecycle/supersession/history.

278. siar-design-review

Triggers/findings/evidence/approval.

279. siar-architecture-exceptions

Time-bounded exceptions/compensating controls.

280. siar-architecture-lint

Machine-enforceable standards in CI.

281. siar-architecture-baseline

Release-pinned architecture baseline.

282. siar-architecture-drift

Expected-vs-observed design conformance.

283. siar-architecture-observability

Aggregate governance health only.

284. siar-architecture-testkit

standards/ADR/exceptions/privacy tests.

285. Security, Privacy & Correctness Invariants

Mandatory:

1. Architecture governance operates on principles, standards, ADRs, design scopes, services, protocols, crates, deployments, risks, and exceptions—not user behavior or employee performance.
2. Hard security/privacy/reliability invariants are non-waivable and cannot be bypassed by architecture exception, executive preference, emergency convenience, or design-review approval.
3. Technical standards are versioned, stateful, scoped, and machine-enforceable where practical; undocumented conventions are not treated as reliable governance.
4. ADRs preserve context, alternatives, decision, consequences, invariants, and migration impact and are immutable historical records that can only be superseded, not rewritten.
5. Design review depth is driven by blast radius, reversibility, trust-boundary impact, persistent-data impact, security/privacy impact, and migration risk—not by team/person status.
6. Exceptions are narrow, time-bounded, owned, evidence-backed, and linked to compensating controls and risk where appropriate; expired exceptions immediately stop authorizing deviation.
7. Architecture governance prefers enforceable Rust types, lint rules, schemas, policy compilation, CI gates, and release checks over repeated manual review of rules a machine can validate.
8. Governance authorities are scoped and separated; no single architect, manager, or reviewer automatically gains universal technical override capability.
9. Architecture compliance and drift reports can influence change/release gates but cannot become developer rejection rankings, exception leaderboards, or workforce-performance analytics.
10. Architecture decisions reference current standards, risks, compatibility, migration, and rollback/exit concerns; high-impact irreversible decisions require proportionally stronger evidence.
11. Governance artifacts minimize private content and personally identifiable operational detail; decision accountability does not justify broad employee or user surveillance.
12. Architecture governance integrates with risk, PIR, change/release, audit, compliance, supply chain, vulnerability management, SLOs, resilience, capacity, performance, geographic governance, and organizational ownership without creating an alternate route around platform trust.

286. Initial Production Scope

Implement first:

typed architecture principles
technical standards registry
standard state/strength/version
Markdown + RON source format
compiled Postcard policy
ADR lifecycle/supersession
design-review triggers
review findings/blocking rules
scoped review authorities
time-bounded exception registry
non-waivable hard-invariant standards
compensating controls
architecture lints
Rust workspace layering rules
dependency/unsafe/crypto/protocol standards
architecture baseline pinning
architecture drift findings
change/release integration
risk/PIR integration
privacy-safe governance dashboards
architecture-governance testkit

Then add:

automated ADR linkage from code/config
graph-based standards dependency model
architecture conformance queries
formal exception/baseline verification
cross-repository architecture linting
automatic stale-standard review prompts

287. Definition of Done

Part 122 is complete when:

• principles/standards/ADRs/reviews/exceptions are distinct and typed;
• standards have lifecycle/version/strength/scope;
• ADR history is immutable and supersedable;
• design reviews use explicit triggers/evidence/findings;
• high-risk review authority is scoped and separated;
• hard invariants cannot be waived;
• exceptions expire automatically;
• machine-enforceable rules are integrated into CI;
• architecture baselines can be pinned to releases;
• implementation drift is detectable;
• architecture governance integrates with risk/change/release/PIR;
• no developer/user surveillance or scoring is created;
• standards/ADR/exception/privacy/fuzz/formal tests are specified.

288. Final Architecture

                ENGINEERING PRINCIPLES
                         │
                         ▼
                 TECHNICAL STANDARDS
                         │
            ┌────────────┼────────────┐
            │            │            │
           ADRs      DESIGN REVIEW   EXCEPTIONS
            │            │            │
            └────────────┼────────────┘
                         ▼
                 ARCHITECTURE BASELINE
                         │
                         ▼
               CI / CHANGE / RELEASE
                         │
                         ▼
               DRIFT / REVIEW / EVOLVE

Architecture-governance safety model:

versioned standards
+
immutable ADR history
+
evidence-based design review
+
scoped authority
+
time-bounded exceptions
+
machine enforcement
+
release-pinned baselines
+
privacy/blame safeguards

not:

let standards live in people's heads, waive anything indefinitely, rewrite old decisions, and rank engineers by how often architecture review rejects them

289. Final Principle

Architecture governance should make technical constraints easier to understand and harder to violate—not make engineering slower or more political.

The correct model is:

state principles clearly
+
encode standards explicitly
+
record durable decisions
+
review high-impact changes
+
waive only what is truly waivable
+
expire exceptions
+
enforce machine-checkable rules automatically
+
preserve historical context
+
never turn architecture governance into people scoring

This architecture gives SIAR a privacy-preserving engineering-decision foundation for technical standards, ADRs, design review, architecture exceptions, compliance, drift detection, and release/change integration while preserving the anonymity, local-first, least-authority, engineering-risk, and anti-surveillance guarantees established across Parts 34–121.