Move worktrees to ~/.Conclave to avoid Windows MAX_PATH issues

[Cellcote]

Summary

• Worktrees previously lived next to the SQLite DB — on Windows that's %AppData%\Roaming\Conclave\worktrees\…, which burns ~50 chars of the 260-char MAX_PATH budget before any repo content is appended. Deep file paths inside a worktree (e.g. nested Views/Shell/... files plus git's own .git/worktrees/<name>/index.lock) push some users past the limit.
• Adds Database.DefaultWorktreeRoot() returning ~/.Conclave on every platform, and points SessionManager.Open() at it.
• Existing sessions keep working: each session row stores its absolute worktree_path, so only newly-created sessions land under the new root. No migration needed.

Fixes #49.

[greptile-apps]

Greptile Summary

This PR moves the git worktree root from <app-data-dir>/worktrees/ to ~/.Conclave on all platforms, reducing the path prefix on Windows from ~50 chars (%AppData%\\Roaming\\Conclave\\worktrees\\) to ~15 chars (C:\\Users\\<name>\\.Conclave\\). The change is minimal and correct: DefaultWorktreeRoot() uses Environment.SpecialFolder.UserProfile cross-platform, the directory is created in the SessionManager constructor just as before, and existing sessions are unaffected because each row already stores its absolute worktree_path.

Confidence Score: 5/5

Safe to merge — minimal, focused change with no logic alterations and no data migration risk.

Both changed files have only targeted, correct modifications. The new DefaultWorktreeRoot() is implemented correctly using Environment.SpecialFolder.UserProfile (cross-platform), the worktree directory is still created at startup, and the DB-stored absolute paths mean existing sessions are unaffected. No P0 or P1 findings.

No files require special attention.

Important Files Changed

Filename	Overview
src/Conclave.App/Sessions/Database.cs	Adds DefaultWorktreeRoot() returning ~/.Conclave via Environment.SpecialFolder.UserProfile on all platforms — correct and intentionally platform-uniform to save Windows MAX_PATH budget.
src/Conclave.App/Sessions/SessionManager.cs	Wires SessionManager.Open() to the new Database.DefaultWorktreeRoot() instead of deriving the root from the DB file's directory — straightforward call-site change, no logic altered.

Sequence Diagram

sequenceDiagram
    participant App
    participant SessionManager
    participant Database
    participant FileSystem

    App->>SessionManager: Open(tokens)
    SessionManager->>Database: DefaultPath()
    Database-->>SessionManager: ~/Library/.../conclave.db (platform-specific)
    SessionManager->>Database: Open(dbPath)
    Database->>FileSystem: CreateDirectory(db parent dir)
    Database-->>SessionManager: db instance

    SessionManager->>Database: DefaultWorktreeRoot()
    Note over Database: Always returns ~/.Conclave<br/>(platform-uniform)
    Database-->>SessionManager: ~/.Conclave

    SessionManager->>SessionManager: new SessionManager(db, "~/.Conclave", tokens)
    SessionManager->>FileSystem: CreateDirectory("~/.Conclave")

    Note over SessionManager,FileSystem: New sessions use ~/.Conclave/<projectId>/<slug><br/>Old sessions unchanged (absolute path in DB)

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