test: consent-gate E2E suite + functional fs-capability probes

Five hermetic gate-tier E2E cases (tpa-present / absent-linux / broken /
absent-darwin / apple-ban) drive the real contract section through
claude -p with PATH shims for aside and uname; the absent cases filter
any REAL aside binary out of the child PATH and assert absence with
Bun.which before spawning, so dev machines cannot leak into detection.
Registered per-case in E2E_TOUCHFILES/E2E_TIERS with template-level
deps (ship/SKILL.md.tmpl, gen-skill-docs.ts) and added to the evals.yml
matrix with tier: gate. eval:bg:periodic's detach timeout rises to
36000s for the grown periodic shard census (floor-enforced by
test/eval-detach-timeout-floor.test.ts); CLAUDE.md doc updated to match.

test/helpers/fs-caps.ts adds canRevokeWrites/canRevokeReads functional
probes; 13 chmod-based tests swap their uid-0-only guards for the
probes so suites skip honestly on CAP_DAC_OVERRIDE containers (this
sandbox: uid 1000 with full caps) instead of asserting revocations the
kernel ignores. path-validation's symlink test targets /etc/passwd
(exists everywhere; /etc/crontab is absent on Amazon Linux).

.github/workflows/evals.yml

@@ -146,6 +146,12 @@ jobs:
           - name: e2e-ship-docsync
             file: test/skill-e2e-ship-docsync.test.ts
             tier: gate
+          # Consent-gate guardrail for the Third-Party Web Actions contract
+          # (Aside recommended-driver rewrite): hermetic shims, deterministic
+          # grep assertions, gate tier in E2E_TIERS.
+          - name: e2e-third-party-actions
+            file: test/skill-e2e-third-party-actions.test.ts
+            tier: gate
           - name: e2e-routing
             file: test/skill-routing-e2e.test.ts
           - name: e2e-codex