docs: migrate project memory governance

.project-docs/10-decisions/adr-template.md

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+# ADR-{number}: {decision title}
+
+## Status
+
+Proposed
+
+## Date
+
+{YYYY-MM-DD}
+
+## Context
+
+{context that made the decision necessary}
+
+## Decision
+
+{decision made}
+
+## Rationale
+
+{why this option was chosen}
+
+## Consequences
+
+- {positive or negative consequence}
+
+## Supersedes
+
+- {older ADR or decision, if any}
+
+## Related
+
+- {related doc or source file}

.project-docs/10-decisions/decision-index.md

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+# Decision Index
+
+## Active Decisions
+
+| ID | Decision | Status | Date | Applies To | Detail |
+|---|---|---|---|---|---|
+| DOC-001 | `.project-docs/` is the sole active project-memory system; feature tasks own task-scoped records and Integration Gate owns canonical memory. | Active | 2026-08-28 | All repository work | [Governance](../../AGENTS.md) |
+| ARCH-001 | AI parsers provide business semantics only; platform state, ERP resolution, execution evidence, and audit remain outside the business operation. | Active | 2026-08-28 | Parser and execution architecture | [System entry](../../README.md) |
+| ROUTE-001 | The machine registry is the authority for 18 parser routes; the two passenger-list routes are Program-only. | Active | 2026-08-28 | Manual and AgentBus intake | [Machine registry](../../control-plane/src/business-routes.ts) |
+| RELEASE-001 | Current artifacts, filenames, versions, and SHA-256 values are defined only by `dist/release-manifest.json`. | Active | 2026-08-28 | Release and delivery | [Release manifest](../../dist/release-manifest.json) |
+| SAFETY-001 | Real ERP access/write, task mutation, extension reload, service restart, deployment, and external delivery require explicit task-scoped authorization. | Active | 2026-08-28 | Operations and maintenance | [Governance](../../AGENTS.md) |
+
+## Superseded Decisions
+
+| ID | Decision | Superseded By | Date |
+|---|---|---|---|
+| DOC-LEGACY-001 | Root `task_plan.md`, `findings.md`, and `progress.md` were the active project-memory system. | DOC-001 | 2026-08-28 |
+
+## Decision Criteria
+
+Create or update an ADR when a choice affects:
+
+- project positioning
+- architecture boundaries
+- public behavior
+- data model
+- long-term maintenance
+- user-facing workflow