session 2026-06-08: ARC W3R Stage 2 (@layer middle path, !important 56→12 live) — session memory + ledger + Fowler skill-harvest + verification-ladder (delayer-diff + token-strip/render-proof cautions)

2026-06-08 14:24:15 +02:00
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@@ -19,6 +19,10 @@ Proven gates, each earned from a real catch. Reach for the one the claim's shape
 - **Byte-identical compile gate** — prove with `cmp`/`diff` at BOTH the direct-invocation level and the full-pipeline level. Proven 3×: SCSS Stage 1 (`c37a3bd`), site.hs listing generator, §I.k transform dormancy.
 - **Expected-delta gate** — when diff=0 is impossible, prove the delta's *complete shape*: `sort -u` over all per-file diffs; every line must belong to a named class (2026-06-04).
 - **Delta classification** — corpus-wide variant: classify EVERY changed line into named classes; the unclassified residue must be exactly empty-or-whitespace. Catches what sampling misses, including one's own shipping comments (decompose + SEO passes, 2026-06-05).
+- **Delayer-diff** (2026-06-08) — for an `@layer`/structural-wrap refactor where the compiled output gains uniform wrappers: strip the `@layer X{`/closing-`}` wrappers from the compiled CSS (brace-aware script), diff vs the true baseline; byte-identical proves nothing *moved, dropped, or changed* — only got wrapped. Proven 3× in W3R Stage 2a. **CAUTION — byte-identical ≠ rendered-identical under `@layer`:** `@layer` overrides specificity, so a structural-wrap byte-proof is *necessary but not sufficient*; render-review is the gate when the cascade *basis* changes (a 5-layer wrap was byte-true yet produced 3 render inversions the diff could not see — the steward's eye caught them). Rendered-identity is then argued *by construction* (only already-winning rules promoted) AND render-reviewed — not inferred from the byte-diff.
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+## Mechanical text transforms ("strip/replace token X across the file")
+- **Token-strip hits prose** (2026-06-08) — a whole-file `sed s/…!important…//` (or any token strip) also removes the token from comments, code-refs, and docstrings, silently mangling prose. Scope the transform to declaration lines, OR compare raw-before vs clean-declaration counts and verify comment integrity after (caught 4 mangled comments via the 56-vs-70 count mismatch; restored). Same family as *Count first, then look* — the word lives in prose too.

 ## Coverage claims ("all X were handled")
 - **Exhaustive route/rule census** — enumerate ALL routes/rules/sections before classifying any; classify each explicitly; no sampling. (The censused-routes discipline; §I.k.c measuring read.)