Use Write tool + --body-file for all skill gh commands to fix permission prompts

[sebastientaggart]

Summary

• Replace all heredoc-based body/notes passing in skill gh commands with a two-step pattern: write content to /tmp/cc_*.md via the file-writing tool, then pass --body-file /tmp/cc_*.md
• This avoids all shell metacharacter issues ($, #, quoted delimiters, substitutions) that trigger Claude Code permission prompts
• Updated all 3 affected source skills (start.md, submit-for-review.md, deploy.md) and regenerated all 12 adapter files
• Works identically across Claude Code, Gemini CLI, Cursor, and Codex

Closes #82

Test plan

• Run /start — verified gh issue create and gh issue comment execute without permission prompts
• Run /submit-for-review — verify gh pr create, gh issue comment, and gh issue create (follow-ups) work without prompts
• Run /deploy — verify gh pr create and gh release create work without prompts

[sebastientaggart]

Review Summary

Verdict: APPROVE

Findings

• [NOTE] The submit-for-review skill instructs the agent to write each follow-up issue body to the same file (/tmp/cc_followup_body.md), which is fine for sequential creation but worth noting — if an agent ever parallelizes the gh issue create calls, the file could be clobbered mid-flight. Current instructions imply sequential execution so this is not a practical issue today.

• [NOTE] All 12 adapter files have updated hashes in their footer comments, consistent with being regenerated by sync.sh. The pattern applied across all three source skills (start.md, submit-for-review.md, deploy.md) is mechanically identical and correctly replaces every heredoc/stdin pattern with the two-step Write-then---body-file approach.

No correctness, security, or convention issues found. The change is a straightforward, well-scoped refactor of how multi-line body content is passed to gh CLI commands — replacing shell heredocs with temp-file writes to avoid permission prompt friction. Commit messages are in imperative mood and explain the "why" clearly.