docs: purge dangling .releaserc/semantic-release mentions (release-please follow-up)

[robsongajunior]

Summary

Completes the repo-wide purge tracked in #818: five files still described the semantic-release / .releaserc mechanism deleted by #798 as if it were current. All verified against the tree before rewriting.

• .claude/rules/compound-api.md (3 mentions), .claude/docs/COMPONENT_REQUIREMENTS.md (2), .claude/skills/component-scaffold/SKILL.md (1) — the .d.ts-at-publish claims now name the real mechanism: the publish workflow (.github/workflows/package-webkit.yml) runs vue-tsc --declaration --emitDeclarationOnly immediately before npm publish, triggered by release-please's release: published. The invariant they document is unchanged (.d.ts stays gitignored, generated at publish, never built in dev/CI) — only the "who runs it" was stale.
• packages/webkit/docs/STYLEGUIDE.md:497 (ships to npm via #exports) — §15 Deprecation "Enforced by" now says release-please maps removal (! / BREAKING CHANGE:) to a major, instead of ".releaserc maps removal to a major".
• docs/OVERVIEW_LINT.md §6 (commitlint) — rewritten beyond the three grep hits because the section was actively wrong, not just stale: the header example showed the leading-ticket form ([ENG-1231] feat(webkit): …) that commitlint now rejects and release-please cannot parse (the exact fix: use @aziontech/theme/animations imports; move vue-tsc to devDependencies #804 released-nothing trap), and the type table still listed hotfix (removed from the enum 2026-07-26) plus the old semantic-release chore/docs/style/refactor/perf → patch mapping. Now: squash-merged PR title is the parsed commit; ticket tag after the colon, only when a real ticket exists; feat → minor, fix → patch, everything else → no release on its own; the sync invariant names release-please-config.json instead of packages/*/.releaserc.

Closes #818. The sixth file from the issue (GOVERNANCE_IMPLEMENTATION.md) was handled by the #819 refresh in #820, which keeps one deliberate past-tense migration note.

Notes

• Docs-only (docs type — no release on its own). No new dependencies. Not breaking.
• Acceptance check from docs: purge dangling .releaserc / semantic-release mentions (release-please follow-up) #818 now passes: grep -rn -e '\.releaserc' -e 'semantic-release' --include='*.md' (excluding CHANGELOGs) returns only release-types.md's deliberate don't-do-this notes and docs(webkit): refresh GOVERNANCE_IMPLEMENTATION for release-please and the current CI pipeline #820's historical migration note.
• All changed files are docs/steering (.claude/*, repo docs/, package docs) — no code mixed in, per the shared-docs-separate-PR convention.