feat(rag): RAG scoping and context isolation controls
- Migration 0030: add conversations.rag_project_id (NULL=orphan-only, -1=all notes, positive=project), projects.auto_summary and projects.summary_updated_at - Three-value scope semantics thread from build_context() → semantic search and keyword fallback via orphan_only + effective_project_id - Project summarization background job (generate_project_summary, backfill_project_summaries) called via Ollama; triggered on project update and note saves (debounced 1h); runs at startup - New LLM tools: search_projects (SequenceMatcher scoring on title+description+auto_summary) and set_rag_scope (persists to DB, workspace-guarded, emits new_rag_scope in SSE done event) - execute_tool() accepts conv_id + workspace_project_id; generation_task passes both and captures scope changes for SSE done enrichment - Frontend: Conversation type gets rag_project_id; chat store adds ragProjectId computed + updateRagScope(); SSE done handler syncs scope - ChatView: replace sidebar ProjectSelector with a scope chip pill above the input bar, animated dropdown, pulse on model-driven scope change Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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