feat(goal): Introduce goal management extension with full-session lifecycle features. Add experimental tab in settings

[tautvydasLiekis]

Linked issue

Closes #

What does this PR do?

Checklist

• I have read CONTRIBUTING.md and agree to the CLA
• This PR links to an open issue above
• Tests pass locally (pnpm run test)
• Lint passes (pnpm run check)
• Documentation updated if behavior changed

[kimchi-review]

Kimchi Code Review

Property	Value
Commit	376a0a4
Author	@tautvydasLiekis
Files changed	0
Review status	Completed
Comments	9 (2 info, 7 warning)
Duration	260s

Summary

📊 Review Score: 84/100 (overall code quality — 0 lowest, 100 highest)
⏱️ Estimated effort to review: 4/5 (1 = trivial, 5 = very complex)

🧪 Tests: yes — Comprehensive new tests cover command parsing, reducer state transitions, status-line rendering, resource filtering, and the full goal-extension lifecycle (creation, edit/pause/resume/clear, todo gating, token budgets, session branching, and continuation). Existing ferment/todo wiring tests were updated for the new session-aware scope-provider signature.

📝 Found 9 issue(s). See inline comments for details.

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[kimchi-review]

📊 Review Score: 84/100 (overall code quality — 0 lowest, 100 highest)
⏱️ Estimated effort to review: 4/5 (1 = trivial, 5 = very complex)

🧪 Tests: yes — Comprehensive new tests cover command parsing, reducer state transitions, status-line rendering, resource filtering, and the full goal-extension lifecycle (creation, edit/pause/resume/clear, todo gating, token budgets, session branching, and continuation). Existing ferment/todo wiring tests were updated for the new session-aware scope-provider signature.

📝 Found 9 issue(s). See inline comments for details.