refactor(plugins): archive unused agents, skills, and disable 5 plugins

[AnExiledDev]

Summary

• Archived 15 agents — agent-system reduced from 19 to 4 active agents (architect, claude-guide, explorer, generalist). Archived agents preserved in agents/_archived/
• Archived 21 skills — skill-engine reduced from 23 to 2 active skills (/team, /agent-browser). Archived skills preserved in skills/_archived/
• Disabled 5 plugins — spec-workflow, git-workflow, ticket-workflow, notify-hook, prompt-snippets set to disabled (pending rewrite)
• Stripped skill-suggester — auto-suggestion now only covers team and agent-browser (was 25+ skills)
• Removed 2 agent redirects — Bash→bash-exec and statusline-setup→statusline-config removed from redirect map
• All agents and skills set to effort: max — active and archived, across all plugins
• ~27k lines removed — massive reduction in plugin surface area

Test plan

• cd container && npm test — verify container tests pass
• cd docs && npm run build — verify docs build
• Verify active agents (architect, claude-guide, explorer, generalist) still load
• Verify active skills (/team, /agent-browser) still work
• Verify disabled plugins don't load (no /spec, /build, /ship, /ps commands)
• Verify skill-suggester only suggests team and agent-browser

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• Commit unit tests in branch refactor/plugin-cleanup

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[AnExiledDev]

Fixes applied:

1. Test expectations — Reduced REDIRECT_MAP assertion from 6 to 4 entries, removed bash-exec from unqualified redirect parametrize list. All 12 tests pass.
2. Orchestrator prompt — Removed bash-exec from delegation instruction, agent catalog table, and selection criteria.
3. AGENT-REDIRECTION.md — Updated REDIRECT_MAP example and file count to reflect 4 active agents.
4. Docs reference/agents.md — Removed 15 archived agent sections, updated redirect table, capabilities matrix, access levels, safety mechanisms, and all counts (19→4).
5. Docs extend/plugins/agent-system.md — Updated agent tables, redirect map, model selection note, and counts.
6. Container README — Updated agent table from 17 to 4 active agents with archive note.

Rebased on staging (post-PR #80/#81 merges), CHANGELOG and setup.sh conflicts resolved.