feat(httpapi): bridge worktree mutations

[kitlangton]

Summary

• Bridge worktree create, remove, and reset through the experimental HttpApi path.
• Migrate worktree route DTOs to Effect Schema with .zod compatibility for legacy Hono/OpenAPI generation.
• Add Hono-bridge coverage for create/list/reset/remove against a real temporary git repository.

Tests

• bun typecheck from packages/opencode
• bun run test:ci test/server/httpapi-*.test.ts test/project/worktree.test.ts test/project/worktree-remove.test.ts from packages/opencode
• ./packages/sdk/js/script/build.ts
• bun turbo typecheck