# S00-021 - Review evidence (security reviewer)

- Reviewer agent: `auto-security-5d2ae592b569`
- Role: security
- Task: S00-021 (remediation of S00-004)
- Owner (executor): `auto-crypto-fcef9b6781bf`
- Date: 2026-10-15
- Result: **APPROVE**

## Scope of review

Verify the executor removed the stated interruption cause ("Agent timed out; process
terminated before escalation") by reproducibly proving S00-004 readiness, without a
requirement bypass. Read: handoff, blocker, ADR 0003, evidence, task card, allowed paths.

## Independent re-checks performed

### 1. Reproduction of the two committed probes (run unchanged from project root)

- `node experiments/0003-crypto-library/session-probe/smoke.mjs`
  Actual: exit code 0, `SMOKE_PASS`. Matches evidence: `KAS_OK known plaintext`,
  631-byte session record stored and reloaded byte-for-byte via
  `@signalapp/libsignal-client` sealed-sender PreKey APIs (audited engine, no
  homegrown ratchet).
- `node experiments/0003-crypto-library/session-probe/wasm-unsupported.mjs`
  Actual: exit code 2, `UNSUPPORTED_BLOCKER`, `wasmFiles: 0`, prebuilds are native
  `*.node` (`darwin-arm64 ... win32-x64`). Matches evidence: no `.wasm` ships; the
  distribution cannot run in a browser worker/WASM endpoint.

Both probes reproduce the evidence exactly. The interruption scenario is therefore
reproducibly re-established rather than dissimulated.

### 2. Registry availability (independent, public npm registry, this run)

- `npm view @signalapp/libsignal version` -> E404 Not Found (WASM web distribution
  not published to reachable registry). Confirms evidence.
- `npm view @signalapp/libsignal-client version` -> 0.105.0 (native addon; AGPL-3.0).
  Confirms evidence and that the E404 is genuine (same proxy serves the real version).

### 3. Scope audit (git)

- `git status`: working tree clean after the executor commit; nothing uncommitted.
- `git show --stat HEAD` (30f7f22): changed files are only the in-scope ADR
  `docs/decisions/0003-crypto-library.md` plus workflow metadata
  (evidence, handoff, commit message, `state/tasks.json`, generated matrices/cards).
- `experiments/0003-crypto-library/**` unchanged (no commit touches it).
Full scope compliance with allowed paths; no spec/plan/shared-contract/source edits.

### 4. ADR content and honesty

`docs/decisions/0003-crypto-library.md` (proposed) states precise capabilities and
boundaries with traceable primary sources. It adopts `@signalapp/libsignal-client`
only as the audited session/ratchet + persistence primitive for the Node-side spike,
and records the browser/worker/WASM endpoint + OMEMO2 wire layer as a blocker (not
success). No homegrown algorithm, no plaintext fallback, no server-side decryption
path is introduced. S00-004 is left blocked; the ADR explicitly forbids declaring it
done on the persistence+Ratchet part alone, preserving ENC-009/ENC-011.

### 5. Foundation integrity

`make check` -> 72 tooling tests, OK (exit 0). Confirms executor's claim.

## Acceptance assessment

1. Interruption cause reproducibly resolved: probe scenario reproduces exactly as
   documented and the browser/WASM OMEMO2 blocker is truthfully recorded for the next
   executor (not a timeout dead-end). PASS.
2. No requirement bypass: S00-004 not declared done; blocker preserved; no fake success.
   PASS.

## Conclusion

Unit-of-outcome met the card acceptance and focused checks; all evidence independently
confirmed; scope clean. APPROVE.

## Communications

- Executor commit message (30f7f22) accurately matches the actual diff and checks;
  no fabricated results found.