fix(ce-compound,ce-sessions): handle non-git CWD in pre-resolved git branch

[tmchow]

Summary

• /ce-compound and /ce-sessions failed to load outside a git repo because !git rev-parse --abbrev-ref HEAD 2>/dev/null`` exits 128 with no fallback. 2>/dev/null only swallows stderr — the non-zero exit propagates and Claude Code reports "Shell command failed for pattern". Pair with `|| true` so the line resolves to an empty value (the existing prose already handles "are empty, omit them from the dispatch").
• Distinct from issue /ce-compound Error: Shell command permission check failed for pattern #722 / PR fix(ce-sessions): 722 ce-compound and ce-sessions permission error #723, which fixed the Repo name line on the same skills (a pipe triggering "multiple operations requiring approval"). [compound-engineering] Bug: ce-compound and ce-sessions fail with "Shell command failed for pattern" outside git repos #730 is the Git branch line — left unchanged by fix(ce-sessions): 722 ce-compound and ce-sessions permission error #723 — with a different failure mode (non-zero exit, not permission check).
• Also fixes the same bug class in ce-work-beta (command -v codex 2>/dev/null exits 1 on machines without codex).
• Adds a hasUnguardedErrorSuppression check to tests/skill-shell-safety.test.ts that flags any pre-resolution command whose trailing top-level statement uses 2>/dev/null without an || fallback. The check ignores non-trailing suppressions where a later always-succeeding statement (e.g., a final echo) ensures exit 0, so it catches real #730-class bugs without false-positiving on the Repo name line.

Test plan

• bun test tests/skill-shell-safety.test.ts — 81 pass, the new per-skill check fails on the unfixed lines and passes after the fix
• bun test — full suite (1045 tests) passes
• bun run release:validate — clean
• Manual: cd /tmp && bash -c 'git rev-parse --abbrev-ref HEAD 2>/dev/null || true'; echo \$? → exit 0
• Smoke test in a fresh non-git directory: /ce-compound and /ce-sessions load without "Shell command failed for pattern"

Fixes #730

🤖 Generated with Claude Code

[chatgpt-codex-connector]

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