Add POST /api/ingest endpoint and run.sh upload hook so agents running
on any machine can stream their JSONL events to the deployed dashboard
in real time.

- ui/server/src/routes/ingest.ts: new endpoint. Validates Bearer token
  (KIP_INGEST_TOKEN env var, optional), checks agent/runId are safe path
  segments, writes events to agents/<agent>/logs/<runId>/absorber.jsonl
  and maintains meta.json (creates on first event, updates completedAt
  and status on session_end). No extra WebSocket wiring needed — the
  existing fs.watch in logs.ts detects the appended bytes and pushes
  them to connected clients automatically.
- ui/server/src/index.ts: register ingest route.
- agents/blueprint-absorber/run.sh: add ingest() inside the inline
  Python log-parser. Reads KIP_INGEST_URL / KIP_INGEST_TOKEN from env;
  if KIP_INGEST_URL is unset the function is a no-op so local-only mode
  is unchanged. Fire-and-forget with 3s timeout — failures are silently
  ignored and never block the agent.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>