feat: add --no-github flag to disable GitHub operations

[lukeinglis]

Summary

• Adds --no-github CLI flag to ceo, run, and tmux subcommands
• When set, injects a directive into the CEO task to skip GitHub issue/PR creation, pushing, and cloning
• Threads the flag through the full call chain: cmd_ceo/cmd_run -> _run_single_cycle -> _build_ceo_task -> _chain_modes
• Includes tmux support (forwarded via shell command string), addressing the review feedback on the previous attempt (feat: add --no-github flag to disable GitHub operations #124)

Changes

Single file: factory/cli.py

1. Argparse: --no-github added to all three subcommand parsers (ceo, run, tmux)
2. Extraction: getattr(args, "no_github", False) in cmd_ceo and cmd_run
3. Task injection: _build_ceo_task() appends a "GitHub Operations Disabled" directive when flag is set
4. Threading: _run_single_cycle() and _chain_modes() accept and forward no_github
5. tmux forwarding: cmd_tmux() appends --no-github to the shell command passed to the tmux session

Context

Supersedes #124, which was missing tmux subcommand support (flagged in review by @akashgit). This PR addresses that gap.

Fixes #122, closes #123

Test plan

• factory ceo --help shows --no-github
• factory run --help shows --no-github
• factory tmux --help shows --no-github
• Flag injects directive into CEO task string
• No directive when flag is absent (default behavior unchanged)
• tmux forwards flag to underlying factory run command

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.20%. Comparing base (d556bbb) to head (54c852e).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
factory/cli.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #163      +/-   ##
==========================================
- Coverage   86.23%   86.20%   -0.03%     
==========================================
  Files          45       45              
  Lines        6307     6316       +9     
==========================================
+ Hits         5439     5445       +6     
- Misses        868      871       +3     

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[akashgit]

Clean implementation: --no-github threads correctly through all paths (ceo, run, tmux, _run_single_cycle, _build_ceo_task, _chain_modes). 19 tests added covering parser defaults, task injection, tmux forwarding, and e2e. Lint clean, all 143 tests pass. Ship it.