chore: upgrade spec-kitty from 0.13.7 to 2.1.3

[AlexU-A]

Summary

• Upgrades Spec Kitty CLI from 0.13.7 to 2.1.3 (20 migrations applied)
• Constitution moved to .kittify/constitution/ directory with governance/directives/metadata
• Missions and scripts relocated under .kittify/overrides/
• New 8-lane state machine with status.json and status.events.jsonl per feature
• Bundled agent skills pack installed (glossary-context, orchestrator-api, runtime-next, etc.)
• Legacy git hooks retired; stale WP gitignore rules cleaned up
• .gitignore updated for 2.x runtime state paths (.kittify/runtime/, events/, dossiers/)

Key changes

• 12 migrations applied: target_branch, constitution_directory, historical_status, retire_git_hooks, consistency_sweep, state_gitignore, install_skills, remove_clarify_command, and 4 skill expansions
• 8 migrations skipped (already in target state)
• 152 files in upgrade commit + 1 .gitignore follow-up

Test plan

• spec-kitty --version reports 2.1.3
• spec-kitty --help shows new commands (agent, constitution, next, research)
• .kittify/metadata.yaml version updated
• Verify spec-kitty dashboard loads correctly
• Verify existing feature specs (005, 006, 011) are readable

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