docs: correct stocktake tally and normalize impeccable license string

[kuker24]

Docs consistency only. No behavior change, no new skills, no version bump.

1. Stocktake tally

adhd was recorded as KEEP in the verdict table even though its body was
edited in the same pass to stop naming Claude Code and GrokBuild as if
either were this runtime. The row's evidence cell already described that edit,
so the table contradicted itself, and the CHANGELOG described four host-name
bodies while the tally showed three UPDATE.

adhd moves to UPDATE (applied) with a writing-for-agents handoff.
Recounted programmatically from the table rows rather than by hand:

Verdict	Before	After
KEEP	57	56
COMPRESS (applied)	2	2
UPDATE (applied)	3	4
MERGE	0	0
RETIRE	0	0
Total	62	62

The CHANGELOG Unreleased tally string is updated to match. Its GrokBuild
bullet already said "four skill bodies" and needed no edit, which is what
made the mismatch visible.

2. impeccable license string

Frontmatter read Apache 2.0; vendor/license-audit.json records
Apache-2.0. tests/test_skills.py normalizes the form, so this was
cosmetic.

One extra edit beyond the literal request: the audit entry's evidence string
was "SKILL.md frontmatter (Apache 2.0)". That parenthetical existed only to
flag the unhyphenated frontmatter. Normalizing the frontmatter alone would
have left the citation quoting a string no longer present in the file, so both
move together and the entry now matches its siblings' plain
"SKILL.md frontmatter". The recorded license and redistribution values are
untouched; no test asserts the evidence text.

Follow-up 3 in docs/stocktake-1.8.3.md is struck through as resolved.
Follow-ups 1, 2, and 4 stay open.

Verification

• python3 -m unittest tests.test_skills — 10 tests, OK
• python3 -m unittest tests.test_license_audit — 2 tests, OK
• python3 -m unittest discover -s tests — 315 tests, OK (skipped=2)
• git diff --check — clean
• json.load on vendor/license-audit.json — parses, entry verified
• Repo-wide grep for stale 57 KEEP / 3 UPDATE / Apache 2.0 — no hits
  outside a third-party citation in full-performance-audit/references/sources.md

Not touched

VERSION stays 1.8.2, no 1.8.3 heading, no tag, no release. No skill body
changed apart from that one license string. GrokBuild image_gen tool-family
names and the A/B baseline are untouched.