feat(worktree): mirror Doppler scopes into worktrees automatically

[mathix420]

Problem

Doppler binds project/config to absolute directory paths in ~/.doppler/.doppler.yaml, so a fresh git worktree starts unscoped and doppler run fails:

Doppler Error: You must specify a project
Doppler Error: The fallback file does not exist
error: script "dev" exited with code 1

Until now the fix was re-running doppler setup by hand in every single worktree.

What this does

New doppler.rs module reads all scopes via doppler configure --all --json and mirrors every scope under a project's main checkout to the rebased path inside the worktree — including per-subdirectory scopes in monorepos (e.g. <main>/apps/web → <worktree>/apps/web), which env-var injection could not express. All writes go through the doppler CLI so we never fight its on-disk format.

Hooked in three places:

• Worktree creation — mirrored right after the LLM-config copy, with a "Linked N Doppler scope(s)" step in the create modal, so the worktree works even outside alacritree.
• First shell in a worktree — a lazy pass (once per worktree per app run) covers worktrees created outside alacritree that the create hook never saw.
• Worktree deletion — drops the mirrored project/config options under the deleted path so the config file stops accumulating entries for dead paths.

Safety

• Existing worktree scopes are never overwritten — a deliberate per-worktree doppler setup (different config, say dev vs dev_personal) survives.
• Cleanup only unsets project/config; tokens and other options are preserved (doppler configure set merges and unset prunes only emptied entries — verified live against doppler v3.76.0).
• No doppler binary installed → silent no-op everywhere.

Testing

• 3 unit tests pin the scope-rebasing rules: root scope → worktree root, subdirectory rebase, and no false match of /repo-other against a /repo prefix (component-wise strip_prefix).
• CLI semantics (--all --json shape, set merge, unset token preservation, parent-scope resolution) verified against a live doppler v3.76.0 using an isolated --config-dir.

🤖 Generated with Claude Code