ci(release-cut): restore the skill-independent version commit (#10460)

#10340 added a ledger-advance step to the release cut, which violates the
contract test #9119 added: the cut must not run generate-skill-bundle-manifest
or stage resources/skills. Both PRs were green on their own branches and only
conflicted once merged, so nothing failed until main had both — main and every
open PR have been red since.

Revert the two workflow lines. The script's --release implementation stays: it
is correct and harmless when unused, and the root fix in #10340 — verify no
longer walking git tags — does not depend on the cut step.

This leaves #10340 semantically incomplete and that must not be dropped. With
the registry seeded from the committed ledger instead of a tag walk, nothing
advances the ledger at cut, so each new skill change re-uses the same unreleased
tail revision for different bytes; older installs then match no known snapshot
and degrade to unrecognized, which reads in the UI as a skill that needs
attention and cannot be updated. Follow-up is to reintroduce the advance
narrowly — stage only resources/skills/release-mapping.json and narrow the
assertion to forbid mutating the content-addressed artifacts while permitting
the provenance row.

.github/workflows/release-cut.yml

@@ -521,14 +521,7 @@ jobs:
           # message and tag name explicitly (avoids npm's `v1.2.3` prefix
           # assumptions and any lifecycle scripts that would run on bump).
           npm version "$VERSION" --no-git-tag-version --allow-same-version
-          # Why: release cut is the single authoritative point where the released
-          # skill ledger advances — this version's working-tree bytes become an
-          # immutable released revision so future builds recognize them as an
-          # official snapshot. It is the only place skill artifacts regenerate;
-          # ordinary lint verifies working-tree bytes against the committed ledger
-          # and never walks tags. Uses only Node built-ins, so no install needed.
-          node config/scripts/generate-skill-bundle-manifest.mjs --release "$VERSION"
-          git add package.json resources/skills
+          git add package.json
           commit_message="release: v$VERSION"
           if [[ "$EVENT_NAME" == "schedule" ]]; then
             commit_message="$commit_message [rc-slot:$SLOT]"