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# Implementation Summary

**Session ID**: `phase08-session02-unified-erasure-contract-and-inventory` **Phase**: 08 - Release Hardening and Legacy Decommission **Package**: Cross-cutting **Completed**: 2026-05-31 **Duration**: 2 hours

***

## Overview

This session defined the shared trusted-erasure contract and the release-scoped storage inventory for Phase 08. It added protocol-owned vocabulary, inventory summaries, negative-claim helpers, read-only server and Worker inventory adapters, focused tests, and documentation updates that keep trusted erasure deferred until later runtime sessions prove the full workflow. No destructive deletion or end-user erasure control was shipped.

***

## Deliverables

### Files Created

| File                                                                                                    | Purpose                                                                                 | Lines  |
| ------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------- | ------ |
| `.spec_system/PRD/phase_08/unified_erasure_inventory.md`                                                | Release-scoped inventory handoff and session 03/04 boundary map                         | \~130  |
| `packages/protocol/src/erasure.ts`                                                                      | Shared erasure vocabulary, inventory rows, summary builders, and negative-claim helpers | \~1065 |
| `packages/protocol/tests/erasure.test.ts`                                                               | Protocol contract, inventory, and unsupported-claim coverage                            | \~221  |
| `apps/server/src/lib/erasureInventory.ts`                                                               | Read-only server erasure inventory mapper                                               | \~291  |
| `apps/server/tests/erasureInventory.test.ts`                                                            | Server inventory sanitization and boundary coverage                                     | \~143  |
| `apps/warroom/src/erasureInventory.ts`                                                                  | Read-only Worker erasure inventory mapper                                               | \~260  |
| `apps/warroom/tests/erasureInventory.test.ts`                                                           | Worker inventory sanitization and boundary coverage                                     | \~141  |
| `.spec_system/specs/phase08-session02-unified-erasure-contract-and-inventory/validation.md`             | Session validation report                                                               | 28     |
| `.spec_system/specs/phase08-session02-unified-erasure-contract-and-inventory/IMPLEMENTATION_SUMMARY.md` | Session closeout summary                                                                | 102    |

### Files Modified

| File                                        | Changes                                                                                 |
| ------------------------------------------- | --------------------------------------------------------------------------------------- |
| `.spec_system/state.json`                   | Marked Session 02 complete, cleared `current_session`, and recorded completion history. |
| `.spec_system/PRD/phase_08/PRD_phase_08.md` | Updated Phase 08 progress and tracker to show Session 02 complete and validated.        |
| `package.json`                              | Bumped patch version `0.1.73` -> `0.1.74`.                                              |
| `packages/protocol/src/index.ts`            | Exported the erasure contract barrel.                                                   |
| `docs/privacy-and-security.md`              | Added inventory reference, no-claim wording, and cleanup-vs-erasure boundaries.         |
| `docs/release.md`                           | Recorded Session 02 erasure evidence and continued no-claim posture.                    |
| `docs/api/README_api.md`                    | Distinguished cleanup, reset, leave, recovery, uninstall, and future trusted erasure.   |
| `packages/protocol/README_protocol.md`      | Documented protocol ownership and consumer rules for the erasure contract.              |
| `apps/server/README_server.md`              | Documented the read-only server inventory helper boundaries.                            |
| `apps/warroom/README_warroom.md`            | Documented the read-only Worker inventory helper boundaries.                            |

***

## Technical Decisions

1. Protocol-first contract ownership: the shared vocabulary and inventory live in `packages/protocol` so server and Worker helpers can consume the same sanitized shape without duplicating erasure terms.
2. Read-only mappers only: server and Worker helpers summarize boundaries, counts, and claims without reading raw payloads, mutating storage, or exposing paths, tokens, or room contents.

***

## Test Results

| Metric               | Value |
| -------------------- | ----- |
| Focused Vitest files | 3     |
| Tests passed         | 12    |
| Typecheck targets    | 3     |
| `git diff --check`   | PASS  |

***

## Lessons Learned

1. Trusted erasure needs a negative-claim vocabulary as much as a positive contract, otherwise cleanup flows can be overrepresented as release-grade deletion.
2. Keeping the inventory sanitized makes it easier to hand off later runtime work without leaking paths, tokens, logs, backups, exports, or replay data.

***

## Future Considerations

1. Session 03 must implement the local/browser runtime deletion flow and prove that the contract maps to real behavior.
2. Session 04 must handle Worker erasure authority and release-gate behavior before any trusted unified erasure claim is made.

***

## Session Statistics

* **Tasks**: 24 completed
* **Files Created**: 9
* **Files Modified**: 10
* **Tests Added**: 12
* **Blockers**: 0 resolved


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