…estrator, CI no-push

- Planner enrichment: query SearchMemoryTool before building the plan prompt;
  inject previously covered topics and article titles so LLM avoids repeating
  already-researched angles across sessions
- POST /orchestrator/sessions: pre-create a pending session record and return
  a stable session_id; frontend now obtains the ID synchronously, navigates
  to the detail page immediately, then opens the SSE stream — eliminates the
  race where session_id was only known after the first SSE event
- Newsletter unified: /newsletter/generate now internally calls OrchestratorAgent
  instead of the standalone newsletter agent, giving newsletters the full
  plan → research → synthesis → email pipeline
- CI: remove GHCR push (docker-build job now build-only, no login step needed)

…ation

- Fix LangGraph deprecation warnings: replace config_schema= with
  context_schema= in both StateGraph builders (deep_research graph);
  type all node config params as Optional[RunnableConfig] instead of
  Optional[dict] in deep_research/nodes.py (5 nodes) and orchestrator
  synthesizer node
- Remove Redis: the service was declared in docker-compose.yml and
  .env.example but never used in any Python code; dropping it simplifies
  the stack and eliminates a spurious depends_on health-check blocker
- Inter-session dedup in collector: before ranking, query the Article
  table for URLs already persisted from prior sessions; fresh articles
  are ranked first; known articles are appended only if nothing new was
  found, preventing empty syntheses when the search space is exhausted

…cker jobs

- ci-python.yml: lint (ruff) + test (pytest + postgres service) using uv
  for fast installs; path filters so it only runs on Python/test changes
- ci-frontend.yml: npm ci + tsc --noEmit + vite build; path filters so it
  only runs on frontend changes
- Remove docker-build and docker-smoke jobs entirely — they required postgres,
  redis, full compose stack and were the main source of flakiness

- ci-python.yml: replace uv pip install --system (fails on PEP 668 Ubuntu)
  with uv venv + uv pip install --python + GITHUB_PATH injection; tested
  locally (200 passed, ruff clean)
- frontend/src/types/index.ts: add AWAITING_APPROVAL to SessionStatus enum
  so session.status comparison compiles without TS2367
- frontend/src/App.tsx: annotate sessionId as string to accept both
  crypto.randomUUID() (branded type) and API-returned string (TS2322)
- Both npm build and tsc --noEmit now pass cleanly