stack/docs/compaction-refresh/reviews/GATE0-PROBE3-BOUNDED-REPAIR-S3-REVIEW-v12.md

# TERRA §3 — Probe-3 Bounded-Repair Re-Review v12

**Verdict: PASS — static byte review only.** No harness, broker, socket, or fixture state was launched or created.

## Reviewed object (GUARD 1)

- **Branch:** `feat/827-gate0-probe`
- **reviewed object = `ca7b522e7beb09fbff64485510201b372d305d34`**
- **v11 baseline:** `93a5fd018d26f16aa58a3ec1afc0c9bc83935fed`
- **Harness:** `docs/compaction-refresh/probes/p3_d4_focused_run.py`
- **Verified harness SHA-256:** `92ff11bd35a72c3bda8f9722837cd9058a711f688cc75bf5e5df106645f81553`
- **Pre-audit reviewed:** `docs/compaction-refresh/reviews/GATE0-PROBE3-PREAUDIT-v12.md` at the reviewed object.

Fresh `git fetch origin feat/827-gate0-probe -q` resolved both local HEAD and `origin/feat/827-gate0-probe` to the reviewed full SHA before the object hash was trusted.

## Null-delta gate

### (a) Exact authorized diff — PASS

The exact harness diff from v11 has `1 insertion, 1 deletion`, one zero-context hunk only:

```diff
@@ -484 +484 @@ def gated_launcher_precondition(
-        "initialize_runtime_generation(generation_file, generation)",
+        "initialize_generation: Callable[[Path, int], None] = initialize_runtime_generation",
```

No other harness hunk or line changed. This is the authorized diagnostic `behavior_markers` entry at L484.

### (b) B5–B9 / D4 security-bearing bytes — PASS

The sole hunk is **old/new L484**, inside the diagnostic marker tuple (L481–489), and does not intersect B5–B9 assertion/control or D4 logic ranges. Independent slice SHA-256 comparisons from v11 to the reviewed object were identical:

| Surface | Range | SHA-256 on both revisions |
| --- | --- | --- |
| B5–B9 controls before marker tuple | L351–L480 | `85eda967698af5699593daa12f761abd4b759a11a03323dc867905d286455aec` |
| B5–B9 controls after marker tuple | L490–L575 | `b92bd920d896450f89a14979dd9a557a82ad590d7c9a73e900ebc89979a48986` |
| D4 generated lifecycle extension | L159–L251 | `4bdc047f7494029d951763555a797103ca25da647b255b287378771d20da209b` |
| D4 runtime assertions (`lease_anchor_registered` included) | L579–L672 | `ddaae13f0302b401ada76f1c96b9f66f2938d7afa614928f4cffb187da832856` |
| D4 orchestration / `--runs` parser | L749–L849 | `a28c36296b2ba8fffe77912b7e25b793047393bae79a9242df1727bd21ab2f92` |

Therefore the diagnostic-only L484 hunk is non-intersecting and all B5–B9/D4 security-bearing bytes are byte-identical to v11.

## Hardened-marker correctness — PASS

- The replacement is exactly `initialize_generation: Callable[[Path, int], None] = initialize_runtime_generation`.
- The exact string is byte-present in the pinned launcher at `f400830738998db105107a2a4c69c7f2a2a6fd5d:packages/mosaic/framework/tools/lease-broker/launch-runtime.py:49`.
- The same launcher imports the real function at L15 and invokes the DI-bound parameter at L90; the marker consequently proves the real helper binding, not merely a same-named call.
- Pinned launcher SHA-256 was independently verified as `e950e4224e280f16979d90cabb89aa1896c5ee28bed2df957e14d018d43cda82`.

## Pre-audit independently re-verified — PASS

All remaining precondition checks pass against the real pinned closure bytes:

| Requirement | Satisfying real bytes |
| --- | --- |
| Remaining launcher markers | registration action L77; DI binding L49; fixture socket env lookup L70; fixture generation path L89; generation-file env assignment L98; exec L101. |
| Generation markers | `lease_generation.py` at `f4008307`: `read_runtime_generation` L78 and `bump_runtime_generation` L90; SHA-256 `061625402f08488eac47acd23272904e71fd1a71fd15b3bdab158632c801be4c`. |
| Pinned broker closure | `p3_generation_broker.py` at `23c0caca`: explicit generation-module load L29–41; fixture socket bind/permissions L46–63; fixture-parent generation-file guard L71–75; SHA-256 `4db4fef1ac6658a8ca79ad5091cefc901d2aa26003265c3d6726c294cf895cad`. |
| Harness path/socket checks | Fixture broker socket equality and no inherited generation file: L452–455; all ten fixture-relative variables: L456–471; temporary-root socket requirement: L473–474. |
| Fixture construction satisfying those checks | Fixture paths/environment L675–736; root-owned workspace/sessions, socket, logs, and extension construction L749–759. |
| Complete pinned closure and hash gates | Exact three-object selection and SHA gate L397–433; materialized pinned files L435–443. |

The six remaining launcher marker substrings and both generation-function substrings were independently checked as byte-present in the pinned objects. Thus no remaining marker or path/socket precondition has a static mismatch with the real closure.

## Required unchanged / absent checks

- **SHA pins:** L41–L43 byte-identical (`7396f46357620118d3da27aa074d422186600e8a4320fc0f56774439af14e877`).
- **SHA gate / before-exec rehashes / bytecode rejection:** unchanged: materialize SHA gate L426; rehashes L539/L565/L568; `reject_pinned_bytecode` L498–501.
- **Fixture:** L704 pre-create and L709 `exist_ok=True` are byte-identical to v11 (L700–L710 slice SHA-256 `3137ef255435ac613fe1332138bbb13111a9d3efc502a34403b3dce21287b04e`).
- **Flags and runs:** unchanged launcher `-s -S -B` (L511–L517), broker `-I -S -B` (L551–L556), and `--runs default=3, choices=(3,)` (L840).
- **Assertions:** `lease_anchor_registered` is intact at L594–L596 in the byte-identical D4 assertion slice; no B5–B9/D4 assertion is softened, removed, or repointed.
- **Absent from the exact one-line harness delta:** P5, P6, P2-banking, retry-laundering, and live/prod-path changes.

## Guard 2 — independent authorship

These review-document bytes were authored by this reviewer session. Repair author `ms-p3-fix` did not author this document; this reviewer did not build or alter the harness and is not Mos.

## Guard 3 — separate publication

This review is committed separately on top of `ca7b522e7beb09fbff64485510201b372d305d34`; its publication commit must preserve the reviewed harness object SHA-256 `92ff11bd35a72c3bda8f9722837cd9058a711f688cc75bf5e5df106645f81553`.

**TERRA §3 v12 PASS.** FIRE remains separately gated on Mos.