Upgrade discovery yield, digest reliability, and runtime UI.

Agent chat: OpenRouter tool-model allowlist, discover UX, plan card polish

Add agent observability (Redis run logs, lab debugger) and copy session export

Harden agent: discover timeout hints, batch marker UI, errors, blocked domains

Improve batch search UX: batch_started card, guards, check_batch fix, discover intent

Cap discover_jobs LLM scoring to 10, timeout guard, Stop stream, vector warn

feat: implement core agent chat framework with tool execution, schema definitions, and initial UI component.

Improve profile panel gating, subscription messaging, and marketing landing.

Move digest status into agent chat; remove launcher card

feat(agent-chat): subscribe CTA when subscription inactive

feat(agent): proactive planning agent with init snapshot and tool budget

feat(agent-chat): add credit top-up action pills

feat(job-launcher): agent chat UI + API; refine Job Scorer home layout