feat(orchestration): director-type picker + DirectorBackend abstraction (#11, #8)

[zaridan]

What

Adds a director-type picker to the ORCASTRATORS launch flow, dispatching the user's choice through a new DirectorBackend abstraction. Closes #11 and #8.

#8 — DirectorBackend (src/renderer/src/lib/director-backend.ts)

A deliberately thin abstraction that wraps the two existing launchers (it does not reimplement them):

• LlmDirectorBackend → wraps launchOrchestratorForProject (the Smart/LLM director). Additive — the existing launcher is untouched.
• RecipeDirectorBackend → constructed with a Recipe, wraps launchRecipeDirector (RecipeDirectorBackend: compile recipe -> task DAG -> orchestration.run, no LLM in worktree #9).

It earns its keep precisely because the picker dispatches through it (no premature standalone abstraction; no Hybrid backend yet).

#11 — director-type picker (DirectorTypePicker + modal wiring)

The ORCASTRATORS + modal now picks the director type first:

• Smart director — your default LLM + /orcastrate (the existing behavior).
• Recipe director — copy: "No director LLM; runs a fixed workflow." — answers "why spend tokens on a director?" before it's asked. A recipe dropdown is sourced from getRecipes().

On confirm the modal dispatches via new LlmDirectorBackend() / new RecipeDirectorBackend(recipe) → .launch(project, …).

Gating: the picker is the gate for experimentalOrchestrators — launchRecipeDirector is ungated by design (per #9), so the Recipe option only appears under the flag. With the flag off, the modal behaves exactly as before (Smart only; agent + task fields shown). In Recipe mode the coordinator-LLM inputs (agent, task prompt) are hidden, since a recipe director seeds no director LLM.

shadcn Dialog/Select + selectable radio cards, design tokens only, all strings i18n'd, cross-platform.

Tests

• director-backend.test.ts — Smart → LlmDirectorBackend → launchOrchestratorForProject; Recipe+recipe → RecipeDirectorBackend(recipe) → launchRecipeDirector with that recipe (launch fns mocked; args asserted).
• DirectorTypePicker.test.tsx — Smart always offered; Recipe only under the flag; dropdown lists every getRecipes() recipe; recipe dropdown hidden in Smart mode.

Green: vitest (8 new), typecheck, electron-vite build, oxlint, localization catalog.

Dependency on #10

Sources the recipe dropdown from getRecipes() in recipe-director-recipes.ts (#10). #10 is merged to main; this branch has been merged up to origin/main and imports getRecipes() directly. Per the lane split, this PR only reads recipe-director-recipes.ts — it does not modify it.

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