Migrate 16 direct Instance.directory/worktree/project reads inside
Effect code to use InstanceState.directory/context helpers that check
the InstanceRef first and fall back to ALS.
- Export InstanceState.directory and InstanceState.context helpers
- bus/index.ts: GlobalBus.emit uses InstanceState.directory
- session/prompt.ts: 5 callsites migrated to InstanceState.context
- session/index.ts: 4 callsites migrated
- session/compaction.ts: 1 callsite migrated
- config/config.ts: 1 callsite migrated
- format/index.ts: 1 callsite migrated
- worktree/index.ts: 5 callsites migrated
- storage/db.ts: Database.effect preserves Instance ALS via Instance.bind
- test/lib/llm-server.ts: add wait/hold/fail SSE stream support
- Remove most provideInstance(dir) wrappers from prompt tests
(5 remain due to Instance.state sync ALS dependency)
This release has a bunch of minor breaking changes if you are using opencode plugins or sdk
1. storage events have been removed (we might bring this back but had some issues)
2. concept of `app` is gone - there is a new concept called `project` and endpoints to list projects and get the current project
3. plugin receives `directory` which is cwd and `worktree` which is where the root of the project is if it's a git repo
4. the session.chat function has been renamed to session.prompt in sdk. it no longer requires model to be passed in (model is now an object)
5. every endpoint takes an optional `directory` parameter to operate as though opencode is running in that directory
