feat: Add advanced agent configuration features to TrueFoundry UI

[harshil-2096]

Summary

Closes #

Changes

How was this tested?

Checklist

• I have read the contributing guidelines
• pnpm build, pnpm test, pnpm typecheck, pnpm lint:ci, and pnpm format:check pass locally
• Tests added/updated where it makes sense
• No hand-edits to generated code (packages/trueforge-sdk, .github/fern/openapi/openapi.json, docs/openapi.json) — fork PRs omit SDK regen; maintainers regenerate after merge
• Docs / .env.example updated if configuration or behavior changed

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Note

Medium Risk
Large UI refactor touching draft agent specs, MCP mount shape, and save/adopt flows; incorrect tool or runtime edits could change persisted agent behavior, though changes are client-side with updated tests.

Overview
Adds a live Agent Config drawer for mutable draft composers (sidebar, drawer, and stack layouts), opened from a new composer control. Edits apply to the active draft immediately; instructions use debounced sync, and Save Agent can overlay unsynced instruction text from the drawer.

The composer Tools picker is narrowed to Connectors and Skills only—runtime capabilities move into Agent Config. Save Agent is refactored into slot-based SaveAgentForm / SaveAgentFormFields and shares AgentConfigEditors with the drawer (model picker + settings, runtime modal, MCP/skills modals).

MCP configuration gains per-connector tool selection (enableTools, preload), a three-pane editor with server getMcpTools, removable connector chips, and clearer row activate vs. checkbox toggles. Model pickers show context/output limits when the catalog provides them; harness adapter maps those fields and implements listTools.

Shell state adds agentConfigOpen (mutually exclusive with settings/library/sessions) and hides duplicate header Save while the drawer is open. @truefoundry/assistant-ui-runtime bumps to 0.1.26; docs/README/changesets describe the new flow.

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🦋 Changeset detected

Latest commit: 0572199

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@truefoundry/trueforge-ui	Minor

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