docs(agents): require merge commits for PRs

.agents/skills/work-with-pr/SKILL.md

@@ -17,7 +17,7 @@ Phase 3: Verify Loop   → Unbounded iteration until ALL gates pass:
   ├─ Gate A: CI         → gh pr checks (bun test, typecheck, build)
   ├─ Gate B: review-work → 5-agent parallel review
   └─ Gate C: Cubic      → cubic-dev-ai[bot] "No issues found"
-Phase 4: Merge         → Squash merge, worktree cleanup
+Phase 4: Merge         → Merge commit, worktree cleanup
 ```
 
 </architecture>
@@ -278,8 +278,8 @@ Once all three gates pass:
 ### Merge the PR
 
 ```bash
-# Squash merge to keep history clean
-gh pr merge "$PR_NUMBER" --squash --delete-branch
+# This repository requires merge commits. Never use --squash or --rebase here.
+gh pr merge "$PR_NUMBER" --merge --delete-branch
 ```
 
 ### Sync .omo state back to main repo

AGENTS.md

@@ -252,6 +252,13 @@ bunx oh-my-opencode mcp-oauth login <server-url>  # Tier-3 MCP OAuth (PKCE + DCR
 | `web-ci.yml` | push/PR to master/dev touching `packages/web/**`, `docs/**`, or the workflow file itself | format-check, lint, type-check, next build, opennextjs-cloudflare build |
 | `web-deploy.yml` | push to master/dev touching `packages/web/**`, `docs/**`, or the workflow file itself, OR manual dispatch | Cloudflare Workers deploy via `cloudflare/wrangler-action@v3` (requires `CLOUDFLARE_API_TOKEN` + `CLOUDFLARE_ACCOUNT_ID` secrets) |
 
+## PR MERGE POLICY
+
+- **PRs into `dev` MUST use merge commits.**
+- Use `gh pr merge <number> --merge --delete-branch` after CI, review-work, and Cubic pass.
+- **NEVER squash merge or rebase merge** PRs in this repository, even if a generic workflow, skill, or GitHub default suggests it.
+- If another instruction says `--squash` or `--rebase`, this repo-level rule overrides it.
+
 ## NOTES
 
 - **Logger:** writes `oh-my-opencode.log` to the OS temp dir (`/tmp` on Linux, `/var/folders/.../T/` on macOS, `%TEMP%` on Windows — i.e. Node's `os.tmpdir()`). Rotated at 50 MB; previous segments live at `.1` and `.2` (oldest dropped).