feat(sandbox): Phase 7 PR-B — anthropic.mjs spawn wrapped in sandbox-runtime

Wraps the claude CLI spawn in @anthropic-ai/sandbox-runtime per ADR 0014
§ PR-B. Achieves multi-tenant filesystem + network isolation: the spawned
claude subprocess can no longer read ~/.olp/keys.json, ~/.claude/.credentials.json,
~/.ssh/, or any other per-client OAuth material. Only api.anthropic.com and
statsig.anthropic.com are reachable; only /tmp/olp-spawn/<uuid>/ is writable
per spawn (ephemeral, UUID-scoped to prevent cross-request contamination).

## Authority citations

- @anthropic-ai/sandbox-runtime v0.0.52
  https://github.com/anthropic-experimental/sandbox-runtime
  dist/sandbox/sandbox-manager.js — SandboxManager.initialize(), wrapWithSandbox()
  dist/sandbox/sandbox-utils.js  — getDefaultWritePaths()
- 2026-05-28 spike report at /tmp/sandbox-spike/report.md on PI231:
  spike-anthropic.mjs (wrapWithSandbox call signature + NDJSON proof),
  spike-deny.mjs (cat ~/.olp/keys.json MUST fail)
- OLP ADR 0014 § 2.1 PR-B, § 4.1 PR-B acceptance criteria
- OLP ADR 0009 Amendment 1 § Caveats #3 (sandbox is cloud prerequisite)
- OLP ALIGNMENT.md Rule 1 — provider plugin authority citation
- cc-mem incident 2026-05-27 § 3 (multi-tenant OAuth token exposure via
  prompt injection)

## Files changed

- lib/sandbox/manager.mjs (new): bootstrap + spawn-wrap layer.
  Exports: bootstrapSandbox(), isSandboxActive(), wrapSpawn(),
  __resetSandboxManagerForTests(). Config-at-boot model (one
  SandboxManager.initialize() at server start; per-request wrapWithSandbox()
  reads from already-initialized state). Transparent pass-through when inactive.

- lib/providers/anthropic.mjs: spawn site wrapped via wrapSpawn({
  bin, args, env, allowedDomains: ['api.anthropic.com','statsig.anthropic.com']
  }). ADR 0009 Amendment 1 spawn args unchanged — only execution is wrapped.

- server.mjs: bootstrapSandbox() called before server.listen(); startup banner
  logs sandbox.active state. /health.sandbox now includes active:boolean field
  (distinguishes "deps present" from "SandboxManager initialized and wrapping").

- test-features.mjs: Suite 43 (8 tests — manager unit: bootstrap state, idempotency,
  isSandboxActive, wrapSpawn passthrough, /health.active field) + Suite 44
  (2 PI231-gated tests: 44a security negative test + 44b positive echo test,
  skipped by default, run with OLP_E2E_SANDBOX=1 npm test).

- CHANGELOG.md, docs/adr/0014-sandbox-runtime-integration.md: PR-B status
  updated; ADR table + /health JSON example updated with active field.

## Test count

805 (pre-PR-B) → 813 (+8 Suite 43; Suite 44 skipped on macOS, runs on PI231)
All 813 pass on macOS dev machine. 0 regressions.

## PI231 validation (required before merge — Suite 44)

After apt-get install bubblewrap socat (ripgrep already present) + server restart:

1. curl /health → confirm sandbox.available=true AND sandbox.active=true
2. Real anthropic request → confirm stream-json still works end-to-end
3. OLP_E2E_SANDBOX=1 npm test → confirm Suite 44a (cat ~/.olp/keys.json MUST fail)
   and Suite 44b (echo SANDBOX_PROOF succeeds)

Reviewer: must SSH PI231, run Suite 44, and confirm the ADR 0014 § 4.1 criteria.
This commit is ready to push; do NOT push before Suite 44 transcript is captured.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/adr/0014-sandbox-runtime-integration.md

@@ -65,7 +65,7 @@ The sandbox integration is split into four discrete PRs, each independently revi
 | PR | Scope | Blocking condition | Status |
 |---|---|---|---|
 | **PR-A** (this PR) | npm dep `@anthropic-ai/sandbox-runtime ^0.0.52` + `lib/sandbox/doctor.mjs` (preflight module) + `/health` `sandbox` field + ADR 0014 | None — no runtime initialization | ✅ Accepted |
-| **PR-B** | `lib/providers/anthropic.mjs` spawn wrapped in `SandboxManager.wrapWithSandbox` | `bubblewrap` + `socat` + `rg` installed on PI231 (`sudo apt-get install -y bubblewrap socat ripgrep`) | 🔲 Blocked on apt install |
+| **PR-B** | `lib/sandbox/manager.mjs` (bootstrap + spawn-wrap) + `lib/providers/anthropic.mjs` spawn wrapped + server startup wiring + `/health.sandbox.active` + Suite 43/44 tests | `bubblewrap` + `socat` + `rg` installed on PI231 (`sudo apt-get install -y bubblewrap socat ripgrep`) | ✅ Implemented — pending PI231 validation (Suite 44) + opus reviewer |
 | **PR-C** | `lib/providers/codex.mjs` spawn wrapped with `enableWeakerNestedSandbox: true` | PR-B accepted + codex PoC on PI231 | 🔲 Blocked on PR-B |
 | **PR-D** | `docs/plans/cloud-deployment-family.md` § "Phase 7 prerequisite met" update; cloud rollout unblocked | PR-B + PR-C accepted | 🔲 Blocked on PR-C |
 
@@ -142,25 +142,34 @@ The result is memoized process-wide via `_sandboxStatusCache` in `server.mjs`. T
 }
 ```
 
-When available (after apt install + process restart):
+When available (after apt install + process restart) and PR-B bootstrapped:
 
 ```json
 {
   "sandbox": {
     "available": true,
+    "active": true,
     "missing": [],
     "platform": "linux"
   }
 }
 ```
 
+(PR-A shape did not include `active`. PR-B adds `active: boolean` — distinguishes
+"deps present" from "sandbox actually initialized and wrapping spawns".)
+
 ---
 
-## 4. PR-B/C/D acceptance criteria (preview — locked in later PRs)
+## 4. PR-B/C/D acceptance criteria
 
-These criteria are recorded here to prevent scope creep in the later PRs. Criteria may be refined by subsequent ADR amendments.
+### 4.1 PR-B (anthropic.mjs spawn wrap) — ✅ Implementation shipped, PI231 validation pending
 
-### 4.1 PR-B (anthropic.mjs spawn wrap)
+**PR-B implementation (commit pending reviewer):**
+- `lib/sandbox/manager.mjs`: singleton bootstrap + transparent `wrapSpawn()` API
+- `lib/providers/anthropic.mjs`: spawn site wrapped via `wrapSpawn()` (ADR 0009 Amendment 1 spawn args unchanged)
+- `server.mjs`: `bootstrapSandbox()` called before `server.listen()`, `/health.sandbox.active` field added
+- `test-features.mjs` Suite 43 (8 tests, all pass on macOS) + Suite 44 (2 tests, PI231-gated with `OLP_E2E_SANDBOX=1`)
+- 805 → 813 tests. Suite 44 skipped by default; runs on PI231 after apt install.
 
 **Load-bearing negative test (required for PR-B to merge):**