docs(core): snapcompact audit — measured shape/recall table, frank-archon image-count budget, 85% trigger law

Live probe against frank-archon (212,916-char archive, 8 planted facts):
auto shape 8on22-bw reads back 8/8 recall at 47% of raw-text billed
tokens; both denser grids drop characters. Lands the docs for the paired
live-config changes (thresholdPercent 95->85, imageCountBudget 16) and
records the catalog-only frame-pricing law (radiance ~2,400 tok/frame vs
the harness's blind 5,024 floor).

Refs #81

omp-docs/log.md

@@ -22,6 +22,22 @@ not restated here — entry, then pointer. That is what the 2026-10-21 audit pas
 newest twelve entries: the facts stayed, the duplicates went, `git log --follow` keeps the
 long form.
 
+## 2026-10-27
+
+### Snapcompact audited against frank-archon; the blind frame price is the real limit
+
+A live recall probe (212,916-char archive, 8 planted facts, four legs) against
+frank-archon: the auto shape `8on22-bw` reads back at full recall for 47 % of
+the billed tokens of raw text, while both denser grids drop characters inside
+identifiers — `snapcompact.shape: auto` stays. `thresholdPercent` returns 95 →
+85 (the max_tokens gap math in `models.yml` was written for 85; 95 routes
+compaction through the overflow-refuse path). `imageCountBudget: 16` lands on
+the frank-archon row: custom providers inherit the unknown-provider floor of 5
+images/request and silently halve the archive. Law: **frame pricing is
+catalog-only** — radiance charges ~2,400 tokens/frame and the harness assumes
+5,024, and no user-row key can fix that until upstream prices
+`openai-completions` vision. Page: [core/snapcompact.md](core/snapcompact.md).
+
 ## 2026-10-21
 
 ### The WAN door into the model registry