Pin claude-code-action to v1.0.88 to dodge symlink ENOENT (#117)

## Summary

- Pin `anthropics/claude-code-action` to `v1.0.88` in
`.github/workflows/claude.yml`
- Works around anthropics/claude-code-action#1187 — v1.0.89's
`restoreConfigFromBase` crashes with `ENOENT: no such file or directory,
symlink` because our `CLAUDE.md` is a symlink to `AGENTS.md` (from #91)
- Every `@claude` trigger has failed since v1.0.89 went out on
2026-04-05; most recent failure:
https://github.com/Quantum-Accelerators/electrai/actions/runs/24089849192

## Why v1.0.88

- Last release before the regression (#1172 / #1174 landed in v1.0.89)
- Upstream fix is anthropics/claude-code-action#1186 but it is still
open; once that ships we can revert the pin back to `@v1`

## Test plan

Note: `@claude`-ing this PR won't test the fix — `issue_comment`
workflows are always resolved from the default branch, so the broken
`@v1` on `main` would still run. The test has to happen post-merge.

- [ ] Merge to `main`
- [ ] Retrigger `@claude review once more` on #84 (it's already failing
on v1.0.89)
- [ ] Confirm the workflow run gets past `Restoring ... from origin/main
(PR head is untrusted)` without an `ENOENT: no such file or directory,
symlink` error
- [ ] Once anthropics/claude-code-action#1186 ships, revert the pin back
to `@v1`

Author: forklady42

.github/workflows/claude.yml

@@ -33,7 +33,11 @@ jobs:
 
       - name: Run Claude Code
         id: claude
-        uses: anthropics/claude-code-action@v1
+        # Pinned to work around anthropics/claude-code-action#1187: v1.0.89
+        # crashes with "ENOENT: no such file or directory, symlink" in
+        # restoreConfigFromBase because CLAUDE.md is a symlink to AGENTS.md.
+        # Revert to @v1 once the fix in #1186 is released.
+        uses: anthropics/claude-code-action@v1.0.88
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}