fix(agent-manager): restore promoted session metadata

[marius-kilocode]

What Problem This Solves

Opening an older session in a new Agent Manager worktree could leave the sidebar using stale local placement metadata. The worktree then lacked the expected session title and branch subtitle.

Why This Change Was Made

Managed session placement is the authoritative source after promotion, including while the project session cache is being refreshed. The live session merge now applies that placement before rendering. A regression test covers the stale-cache case.

User Impact

When an older session is opened in a worktree, the worktree card immediately shows the session title and branch name.

Evidence

• bun test tests/unit/project-sessions-live.test.ts tests/unit/agent-project-sessions.test.ts tests/unit/project-session-filter.test.ts
• bun run typecheck
• bun run lint
• bunx prettier --check webview-ui/agent-manager/project/sessions-live.ts tests/unit/project-sessions-live.test.ts
• Isolated VS Code self-test: opened Agent Manager history, selected Open in worktree, and verified the live DOM showed the session title and almond-scorpio branch subtitle.
• Final isolated VS Code console contained no errors.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/restore-promoted-worktree-title.md
• packages/kilo-vscode/tests/unit/project-sessions-live.test.ts
• packages/kilo-vscode/webview-ui/agent-manager/project/sessions-live.ts

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_{Reviewed by grok-4.6 · Input: 55.6K · Output: 6.7K · Cached: 275.7K}

_{Review guidance: REVIEW.md from base branch main}