docs(lessons): record two patterns from PR #85's round 4

A config's local mode can prove nothing about the mode that ships:
repo: local collapses the clone prefix, cwd and repo root into one
directory, so a byte-identical entry: string worked locally for a
reason that exists only locally, through three review rounds.

Deleting a token from a shared artifact breaks whatever parses it,
silently: dropping --config killed the loop that gave the bundled
Vale styles release coverage, shrinking a derived path list with no
error and no failing test.

Kept separate from the adjacent "clean linter result" and "one signal,
two consumers" entries, which describe different failure modes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MCQ648fLSFXPHGZdQ8gn58

LESSONS.md

@@ -151,3 +151,11 @@ Vale's output fed two consumers with different contracts: the audit skills read
 ## 2026-08-08 — Measure a rule's false-positive rate at the severity you will ship it at
 
 `Kyberforge.VagueQualifier` was cherry-picked from `write-good` after being trialled as "low-noise against this repo's corpus" — but the trial ran at `level: warning`, where a false positive costs nothing because nobody ever sees it. Shipped at `error`, the same false positive costs a blocked commit and a permanent suppression comment. Re-measured at the severity it actually shipped at, the rule scored one marginal true positive and one unfixable false positive across 41 files (`caveman/SKILL.md` *quotes* filler words as its subject matter — a mention, not a use), and was deleted. Fix: trial conditions must match shipping conditions. A noise measurement taken where false positives are free does not transfer to a context where they are expensive, and "low-noise" is not a property of a rule alone — it is a property of the rule at a severity.
+
+## 2026-08-09 — Exercising a config's "local" mode proves nothing about the mode that ships
+
+The root `.pre-commit-hooks.yaml` shipped Vale hooks whose `entry:` carried a `--config <repo-relative-path>` argument. pre-commit prefixes only `entry[0]` with the hook-repo clone path (`cmd = (prefix.path(cmd[0]), *cmd[1:])`), so every later argument resolves against the *consuming* repo's root: each external consumer hard-failed with `E100 [--config] Runtime error ... does not exist`, and two of the three hooks ADR-0014 promised were unusable. The defect survived three review rounds of PR #85 and a green `pre-commit run --all-files` every time, because this repo consumes the same hooks through `repo: local`, where the clone prefix, the cwd, and the repo root are one directory — the byte-identical `entry:` string worked locally for a reason that exists only locally. Nothing under `tests/` exercised the manifest as a hook repo at all. The sharp part: the local run was not weaker evidence of the same thing, it was evidence of a different thing, and the two were indistinguishable by reading either file. Fix: when a config has a local mode whose resolution semantics differ from the shipped mode, test the shipped mode against a real consumer — `tests/test-vale-hooks-consumer.sh` stands up a `file://` clone of this repo and runs the hooks from it — and then delete the divergence rather than living with it: `vale-wrap.sh` now self-locates its config from `${BASH_SOURCE[0]}`, and the local and shipped `entry:` lines are identical, so the local run no longer exercises a path no consumer takes.
+
+## 2026-08-09 — Deleting a token from a shared artifact breaks whatever parses it, silently
+
+Dropping the `--config` argument from `.pre-commit-hooks.yaml` was the right fix, but `scripts/check-release-needed.sh` derived its release-relevant path list by scanning those same `entry:` lines for `--config` and taking the target's `dirname` — that parse was the only thing giving the bundled `.vale.ini` and its sibling `styles/` tree release coverage. With the token gone the loop simply never fired: no error, no failing test, no warning, just a path list that shrank from six entries to four and lost both `assets/vale/` trees. Consequence: a change to a Vale *rule* could land on `main` without demanding a release tag, leaving external consumers pinned to an old `rev:` with stale rules — the exact drift the gate exists to prevent. It surfaced only because the agent making the change reported it as a suspected side effect of its own edit, and was confirmed by diffing the derived path list before and after. Fix: before removing a token from an artifact more than one script reads, grep for everything that *parses* the artifact, not just everything that consumes its documented purpose. The smell to watch for is a loop that builds a list, where an empty or short list is indistinguishable from a correct one — assert on the expected members, so a derivation whose input vanished fails loudly instead of quietly covering less.