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Formalize the branch↔issue relationship and add a release/version-tagging policy. Branch/issue linkage: - scripts/worktree-start now validates branch names: implementation branches must match (fix|feat|docs|chore)/issue-<number>-<slug>; review branches review/pr-<number>-<slug>. Untraceable names are rejected with a clear error (exit 2). New --allow-unlinked override for genuine exceptions. --dry-run preserved. - Documented issue → branch → worktree → PR → cleanup traceability in the runbook and the portable SKILL, including the claim-comment convention and Closes #n / Refs #n PR-body usage. - Noted that Gitea exposes no native issue→branch API field (only a PR head branch), so linkage is enforced via branch name + claim comment + PR body + cleanup. Versioning / tagging policy (docs only; no release automation yet): - SemVer vMAJOR.MINOR.PATCH (v0.x.y while unstable) with PATCH/MINOR/MAJOR bump rules. - Annotated tags only, from the exact commit on remote master, only after the full suite passes, with release notes referencing merged PRs/issues. Never tag feature branches, dirty worktrees, unreviewed/self-authored work, or commits not on remote master. - Release runbook in the runbook + SKILL, plus a new skills/llm-project-workflow/templates/release-tag.md prompt template. Tests: worktree-start branch validation — accepts fix/feat/docs/chore/issue-* and review/pr-*, rejects fix/random-name / my-branch / non-numeric issue, honors --allow-unlinked, preserves --dry-run. Full suite 291 passed / 0 failures; bash -n clean; git diff --check clean; no secrets. Release-tag automation (a scripts/release-tag helper) intentionally deferred to a later issue to keep this diff narrow and testable. Closes #48. Refs #38, #39, #46. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>