{"body":"**Row 163 r2 review (Filbert): approve**\n\n**What I reviewed:**\n- Candidate 2c090eefd on code 2a5f3a3a0, base 4f02486d5.\n- Manifest c6f4f4c12596: all 10 files match (`sha256sum -c`).\n- r2/candidate.diff in packet 7af166574 is byte-identical to `git diff 4f02486d5 2c090eefd`.\n- Base drift: nothing has landed on these files on refactor since the base.\n- Since r1 (4be3f6aec), four files changed: stack-release.test.mjs, session.mjs, session.test.mjs and BUILD.md. stack-release.sh is still blob 0053f35d1360; cli.mjs, launcher.mjs and TOOLS.md are unchanged.\n\n**Tests I ran** (my own worktree, 15:26-15:39Z, TMPDIR ~/fs1632, totals summed by script):\n- stack-release.test.mjs: 166/166\n- launcher.test.mjs: 29/29\n- host.test.mjs: 42/42\n- session.test.mjs: 12/12\n- Total: 249 pass, 0 fail.\n\n**Mutants:** I reran my r1 mutants and added N1. All seven are now killed:\n\n| Mutant | What it breaks | Killed by |\n| --- | --- | --- |\n| M1 | `live-config-unchanged` always passes | R14 |\n| M2 | `backup-unchanged` always passes | R14 |\n| M3 | `credential-ref-live` accepts an env ref | R9 |\n| M4 | `data-root-scratch` mismatch dropped | R11 |\n| M5 | `no-session` ignores `launches/` | R4 |\n| M6 | no INT/TERM/HUP trap | R15 |\n| N1 | read-only return in `Registry #write()` dropped | session test \"a read-only Registry never writes sessions.json, refuses add() and leaves the file on remove()\" |\n\n**My r1 findings:**\n- **F1, fixed.** R14 uses a host-touches fault and covers three files: the live config, the live business file and the backup bus.sqlite. Each case gives exactly one FAIL by name, after PASS gate and PASS host-stopped.\n- **F2, fixed.**\n  - R9: an env case with the exact message.\n  - R11: an other-root case and a no-root case, both refused before the host starts.\n  - R4: a host-launches-dir case.\n- **F3, fixed.** R15 sends TERM, INT and HUP while the gate is waiting on /healthz.\n  - It asserts the full name list: PRE plus migration, FAIL signal, then all five stop and end checks PASS.\n  - It also checks REHEARSAL_FAIL, exit 1, and that the host pid is gone.\n  - The Console's stop is proven by PASS console-stopped.\n- **N1, fixed.** `#write()` returns at once under read-only, so the constructor, add() and remove() all follow the same rule, and the session test covers remove().\n\n**Read and found correct:**\n- The new rHost faults only act when their fault file is present, so the existing cases don't change.\n- The `e.during` hook is optional (`?.`), so the other R tests don't change.\n- The session.mjs header comment matches the new behavior. BUILD.md's round 2 section matches the code.\n- No test pins a hash of any changed file.\n\n**Landing:** per Mos's order, this lands after B7, with a fresh gate if the base moves.\n"}