Merge pull request 'Add fail-closed branch-identity proofs for author commit/push workflow (Issue #177)' (#181) from feat/issue-177-branch-drift-proofs into master

skills/llm-project-workflow/templates/start-issue.md

@@ -26,8 +26,19 @@ Steps:
    cd branches/<type>-issue-<n>-<slug>
 6. Implement the narrow scope only; add/update focused tests if behavior changes.
 7. Checks: run the test suite, compile/lint changed files, git diff --check,
-   and scan the diff for secrets.
-8. Commit (issue-linked message), push the branch, open a PR to master.
+   and scan the diff for secrets. Record the branch name and HEAD SHA at
+   validation time.
+8. Branch proof before commit (#177) — prove and state:
+   - git branch --show-current == the intended issue branch from step 5
+   - the branch is NOT master/main/develop/development/dev
+   - branch and HEAD unchanged since step 7 (another session can switch a
+     shared checkout mid-session; if drift is detected, STOP and reconcile
+     before committing)
+   If a commit accidentally lands on a protected branch: do NOT push;
+   report the accident and the exact repair steps — never silently continue.
+9. Commit (issue-linked message). Branch proof before push (#177): local
+   branch == push target branch == intended issue branch, none protected.
+   Then push the branch and open a PR to master.
    *The PR body MUST use closing keywords like `Closes #N` or `Fixes #N` to close the issue; do NOT use `Implements #N` or `Refs #N` for closing, as Gitea will not auto-close it.*
    Include an "LLM Handoff Metadata" block in the PR body (attribution only;
    never an eligibility input — docs/llm-agent-sha.md):
@@ -40,7 +51,7 @@ Steps:
    - Branch: <branch>
    - Worktree: <worktree path>
    - Self-review allowed: no
-9. Stop before review/merge — you are the author.
+10. Stop before review/merge — you are the author.
 
 Handoff: end with a section titled exactly `Controller Handoff` per SKILL.md
 §K (compact; long form only on the high-risk triggers), including the author