[enhancement] Upgrade to Copilot SDK v0.1.30 and audit for breaking changes

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Background

Planeteer currently uses @github/copilot-sdk v0.1.24 (from package.json). The SDK has released v0.1.30 on March 3, 2026, which is 6 versions ahead.

Recent SDK releases include:

• v0.1.30 (March 3): Tool overriding, session.setModel() API (release notes)
• v0.1.29 (Feb 27): Python exception handling changes
• v0.1.28 (Feb 27): Breaking change - deny all permissions by default, clientName in SessionConfig

The v0.1.28 release notes specifically mention a breaking change around permission handling (PR #509).

Proposal

Perform a systematic upgrade to v0.1.30 with full compatibility testing:

1. Update dependency - Bump @github/copilot-sdk to ^0.1.30 in package.json

2. Review breaking changes - Audit release notes for v0.1.25 through v0.1.30 to identify:

   • API changes that affect src/services/copilot.ts
   • Permission handling changes (v0.1.28 breaking change)
   • Any deprecated APIs that Planeteer currently uses

3. Update integration layer - Modify src/services/copilot.ts to:

   • Add clientName: "planeteer" to SessionConfig (new field in v0.1.28)
   • Ensure permission handling is explicit (v0.1.28 denies all by default)
   • Update any deprecated API usage

4. Comprehensive testing - Run full test suite and manual testing:

   • All screens (Home, Clarify, Breakdown, Refine, Execute)
   • Session event handling and compaction
   • Multi-turn conversations and refinement
   • Parallel task execution with dependency graph

5. Update documentation - Document any behavior changes users should be aware of

Benefit

• Access to new features: Unlocks tool overriding and model switching capabilities
• Bug fixes: Get all fixes from 6 intermediate releases
• Security: Stay current with SDK security patches
• Future compatibility: Reduces technical debt and makes future upgrades easier
• Performance: Benefit from any SDK performance improvements

Acceptance Criteria

• package.json specifies @github/copilot-sdk version ^0.1.30
• npm install completes successfully with no peer dependency conflicts
• All release notes from v0.1.25-v0.1.30 reviewed and breaking changes documented
• src/services/copilot.ts updated for any API changes (e.g., clientName field)
• Permission handling explicitly configured (not relying on defaults)
• All existing tests pass (npm test)
• Manual testing of all user flows completed successfully
• Session compaction and event handling still work correctly
• Documentation updated if any user-facing behavior changed
• Memory stored with verified build/test commands if any changes needed

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