# Linux 90 — passage candidate census

Read Astra pass 3 before implementation. The owner-world census compiled 54,324 sparse 4 m bricks with a 10 m reach and four independent, uncapped candidate lists. The density proof used the incoming-sample bound `-d·Q + 0.24 m`; samples whose bound exceeded 10 m explicitly kept the existing passage work. The build emitted 217,072 carve, 24,359 tread, 5,416 clearance, and 57,594 mouth/column references, with zero compiler failures. Build time was 26.3–27.9 ms; estimated memory was 12,667,000 bytes (about 12.1 MiB).

List-size distributions are weighted across 30,681,829 near-LOD sample hits. Percentiles include zero-candidate samples; the active percentiles include only nonempty lists. The `16+` column is a reporting bucket; the stored lists have no cap.

| Semantic | Nonempty hits | All-hit p90/p95 | Active p90/p95 | 16+ of hits |
|---|---:|---:|---:|---:|
| Carve | 52.89% | 11 / 13 | 13 / 14 | 1.65% |
| Tread | 33.53% | 3 / 4 | 4 / 4 | 0% |
| Clearance | 15.60% | 1 / 2 | 2 / 3 | 0% |
| Mouth/column | 41.35% | 11 / 12 | 13 / 14 | 0.88% |

Measured passage time still retained by explicit reach fallback:

| Stratum | Fallback share |
|---|---:|
| S0 | 24.94% |
| FI | 12.19% |
| TN | 19.03% |
| S3 | 42.57% |
| Weighted | 18.28% |

Every final proof counter was zero for omitted carve, tread, clearance, route, column, or bridge candidates. All fallback was due to the 10 m reach limit. The 3,897,959 fallback iterations still visited 19.51M carve segments, 9.61M tread segments, and 3.77M clearance capsules (plus 14,163 mouth checks). Both stop conditions fail: carve and mouth/column active p90s are 13 candidates, and fallback exceeds 10% in every stratum. **Stop here; no junction evaluator prototype was built.**

## Verification and runs

- Fast tier: **PASS**, 269 checks and 5 diagnostics in 296.2 s. Pinned hash and determinism checks passed.
- Linux `VFHostEditor` after timing: **PASS**, 27/27 actions in 69.13 s with `-NoUBA -MaxParallelActions=4`; no address-space limit. Three existing RealtimeMesh deprecation warnings were emitted.
- The first census collection was discarded after review found its column proof recorder read the distance before assignment. The recorder was fixed and the complete four-stratum census rerun; final column proof misses are zero.
- No run exceeded 30 minutes. No prototype replay, W8/W12 prototype timing, capture, or version bump applies after the census stop. The compiled lists are opt-in census data and are not wired into production evaluation.

Source stamp: `c797603e5272850855e448a6177ae32dccdeb20974484a725324ebbc0903106d`. Logs and census data are under `Saved/Linux/l90/`. No commit, push, or stash was made.