feat(architecture): delete machine authorization, parity, guardSemantics (PR 3/6)

[hzcheng]

Summary

PR 3/6 of the Harness Simplification program (docs/architecture/harness-simplification-decision.md). Deletes the old machine-authorization chain now that the trusted kernel has taken over: run-guard-mutation-parity.js, guardSemantics, and Architecture Change record consumption. Net -797 lines.

This PR is classified relaxing (it deletes guard machinery), so it requires owner architecture approval — see the Owner approvals section.

What changed

• Delete scripts/run-guard-mutation-parity.js; remove parity from tests, protected paths, and release packaging.
• Remove guardSemantics from the record schema and delta flags; Architecture Change records are historical ADRs only.
• checkArchitectureChange.js: no record matching; a relaxing/re-partition classification is authorized only by the owner's approve-architecture <full-head-sha> comment (consumption wired in transition PR feat(architecture): wire approve-architecture consumption (transition to PR 3/6) #297).
• describeArchitectureChange.js: diff reporter only.
• run-trusted-kernel.js: materialize the head via git ls-tree + git show; consume the owner's approve-architecture comment via the GitHub API (fail-closed).
• trustedKernel.js: drop the deleted parity script from protected paths (kernel evaluator fixes landed separately in fix(architecture): make the trusted kernel evaluate real heads #298).

Skill harvest

none — both lessons from this rescue (default-branch check ownership, owner-approvals convention) were already recorded in #297 and #299.

Owner approvals

Copy each line into a separate PR comment below (both bind the exact head SHA and expire when the head moves):

approve-architecture 6af42109faaf686b8d6d8a1f107b243bb22a745a

approve 6af42109faaf686b8d6d8a1f107b243bb22a745a

Change impact declaration

{
  "headSha": "6af42109faaf686b8d6d8a1f107b243bb22a745a",
  "capabilities": [
    "MAIN-ARCHITECTURE-HARNESS"
  ],
  "modules": [],
  "invariants": [],
  "policyDelta": "relaxing",
  "baselineWaiverDelta": "zero",
  "newFiles": [],
  "behaviors": [
    "ARCH-CHANGE-GATE-001",
    "ARCH-CLOSED-WORLD-001",
    "ARCH-INVARIANT-CATALOG-001",
    "ARCH-MODULE-BOUNDARY-001",
    "ARCH-MODULE-CYCLE-001",
    "ARCH-POLICY-SCHEMA-001",
    "ARCH-PROGRAM-LEDGER-001",
    "ARCH-SINGLE-WRITER-001",
    "ARCH-WEBVIEW-MANIFEST-001"
  ],
  "semanticImpact": {
    "stateAuthority": false,
    "writerSet": false,
    "protocol": false,
    "persistence": false,
    "identity": false,
    "recovery": false
  },
  "coordinators": [],
  "verification": "npm run test-compile; node --test tests/unit/architecture/** tests/unit/tooling/** (549 pass); ARCHITECTURE_APPROVED=true npm run test:architecture-policy; node scripts/run-trusted-kernel.js: passes with approval, fails closed without; npm run test:behavior-contracts; npm run lint"
}

[hzcheng]

approve-architecture 88553fb

[hzcheng]

approve 88553fb

[hzcheng]

approve-architecture 6af4210

[hzcheng]

approve 6af4210