Add Github Copilot Provider

[zortos293]

What Changed

• Added Copilot provider support across the server, shared contracts, and web UI.
• Wired up Copilot adapter/session/health handling and related model plumbing.
• Fixed thread provider binding so threads stay attached to the correct provider.

Why

• This makes Copilot available as a first-class provider while keeping provider selection and thread routing predictable.

UI Changes

• Updated provider picker/settings surfaces to include Copilot-related behavior and provider health state.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add GitHub Copilot as a supported AI provider

• Introduces a full CopilotAdapter service in CopilotAdapter.ts that integrates @github/copilot-sdk, supporting session start/resume, turn sending/aborting, interactive permission prompts, user-input requests, model/reasoning-effort switching, and thread reading.
• Adds Copilot to the provider registry, health check system, session directory decoder, and server provider layer so it is available alongside Codex and Claude.
• Extends contracts, shared model utilities, and app settings to define Copilot model slugs, aliases, default model (claude-sonnet-4.6), reasoning effort options, and persisted settings for copilotCliPath and copilotConfigDir.
• Adds a settings UI section for Copilot CLI path and config directory, a GitHub icon in the model picker, and a PROVIDER_OPTIONS entry labeled 'GitHub Copilot'.
• Includes a patch for @github/copilot-sdk@0.1.32 to fix an ESM import path in dist/session.js.

📊 Macroscope summarized 0a91001. 33 files reviewed, 8 issues evaluated, 1 issue filtered, 4 comments posted

🗂️ Filtered Issues

apps/web/src/appSettings.test.ts — 0 comments posted, 1 evaluated, 1 filtered

• line 233: The test expects claude-sonnet-4.6 (with a period) for the copilot provider, but the analogous claudeAgent test on line 227 expects claude-sonnet-4-6 (with a hyphen). This inconsistency suggests a copy-paste typo - either the model slug format is wrong (period vs hyphen), or the copilot test should be checking for a copilot-specific normalized slug rather than a claude model slug. [ Out of scope (triage) ]

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