Add an --all-docs mode to check-doc-skill-refs.sh that scans the union of the
pinned doctrine files PLUS the full LIVE docs/** set (scripts/lib/docs-scope.sh),
ratcheted by a new filename-pinned shrink baseline
(scripts/.docs-skill-refs-baseline). Two-way ratchet: a non-baselined live doc
with a dead `/skill` ref FAILS; a baselined file that no longer offends FAILS
demanding a prune. Detection stays slash-syntax + headings only (never bare
skill names). Default (no-flag) behavior is byte-identical.
docs/SKILL-ROUTER.md (the curated router) is covered by --all-docs (a live
docs/** file, never baselined) so a dead ref there FAILS strict, without
perturbing the byte-identical default doc count.
seed.go docs.skill-refs row: Match widened to docs/** + the baseline + the lib;
Args set to [--all-docs --strict]. Burn-down (long-tail only): repointed retired
`/retro`->/post-mortem, `/vibe`->/validate, `/ratchet`->/flywheel,
`/research-multi`->/research, `/implement-wave`->/crank, and reworded the
retired `/dream` across 13 docs/levels + docs/workflows + docs/philosophy
pages, then pruned them from the baseline (91 -> 78 offenders). Owner-locked
pages (comparisons/getting-started/positioning) stay baselined.
Bats twin tests/scripts/check-doc-skill-refs-all-docs.bats covers all the modes.
boshu