Delete dead runners (bob/codex/opencode) and runner infrastructure cleanup

[osilkin98]

Context

Only the Claude runner is supported going forward. Three runner implementations have zero production call sites (confirmed by PR #1302).

What to delete

Implementation files (888 lines)

• factory/runners/bob.py (316 lines)
• factory/runners/codex.py (219 lines)
• factory/runners/opencode.py (353 lines)
• factory/runners/usage.py (179 lines) — all callers are dead runners

Dead test files (~2,600 lines)

• tests/test_codex_runner.py (612 lines)
• tests/test_opencode_runner.py (646 lines)
• Bob/OpenCode test classes in tests/test_runners.py (~570 lines across 7 classes)
• Codex test classes in tests/test_plugin_agents.py (~112 lines across 3 classes)
• Bob tests in tests/test_session_resume.py (~20 lines)

Infrastructure cleanup (modify, don't delete)

• factory/runners/__init__.py — remove imports, _RUNNERS dict entries, __all__ exports for dead runners
• factory/cli/_parser_groups.py — remove codex from --runner choices
• factory/user_config.py — remove bob/codex example profiles and env var mappings
• factory/ceo_completion.py — remove BobRunner comment
• tests/conftest.py — remove FACTORY_BOB_DRY_RUN=1 setup
• factory/agents/plugin.py — remove codex TOML generation functions (~60 lines)
• factory/cli/admin.py — remove codex import and --runner codex branch (~30 lines)
• scripts/sync_agents.py — remove codex imports and sync logic (~40 lines)

Dead documentation

• docs/codex-mcp.md (78 lines)
• docs/runner-v2-spec.md (202 lines)

Dead environment variables

• FACTORY_BOB_DRY_RUN, FACTORY_BOB_MAX_INVOCATIONS_PER_CYCLE, BOBSHELL_API_KEY
• FACTORY_CODEX_DRY_RUN, CODEX_API_KEY
• FACTORY_OPENCODE_DRY_RUN, FACTORY_OPENCODE_MAX_INVOCATIONS_PER_CYCLE

Verification

All verified to have zero production call sites outside the runner subsystem itself. See PR #1302 Section 2 for full evidence.

Related

• Dead-code pruning report — comprehensive analysis of ~7,800 removable lines #1301, Prune dead tests for removed runners and node types #1331
• Also clears factory.md smoke test's -k 'not BobAuth' filter