Web app missing background jobs: research, signals, recommendations, heartbeat

[contractorr]

Problem

The web app calls `scheduler.start()` on startup, which only registers:

• `intel_gather` (scraping)
• `entity_extraction`
• Extended jobs (company movements, hiring, regulatory — if enabled)

The CLI daemon's `start_with_research()` additionally registers:

• `deep_research` (weekly)
• `weekly_recommendations` (weekly)
• `signal_detection` (daily)
• `autonomous_actions` (daily)
• `heartbeat` / `goal_intel_matching`
• `trending_radar`

Web-only users get none of these. The insight store is empty, recommendations aren't auto-generated, signals aren't detected, goal-intel matching doesn't run. This significantly degrades the web experience compared to CLI+daemon users.

Root Cause

`src/web/app.py` calls `scheduler.start(cron_expr=cron)` — the simple path. `start_with_research()` requires an `AdvisorEngine` instance and config, which the web app doesn't construct at scheduler init time.

Proposed Fix

1. Add a `start_web()` method to `IntelScheduler` that registers the full job set but constructs engines lazily (on first job execution, using the shared/default API key)
2. Or: make `start_with_research()` accept a factory callable instead of a pre-built engine
3. Gate research/recommendation jobs behind having a valid API key (shared key users may need different limits)

Scope

• `src/intelligence/scheduler.py` — new entry point or refactor
• `src/web/app.py` — call the full scheduler path
• Config: respect `agent.enabled`, `agent.autonomous.*` settings

Notes

• This is a gap in existing functionality, not a new feature
• May need rate limiting for shared-key users (research + recommendations both call LLMs)
• Signal detection and goal-intel matching are lightweight (mostly DB queries + optional LLM scoring)

Acceptance Criteria

• Web app runs signal detection, goal-intel matching, trending radar on schedule
• Weekly recommendations and research run if user has own API key
• Insight store populated for web-only users
• No regression for CLI daemon users