Adds the agentMetrics table to SQLite schema for storing pre-computed
per-agent event counts (questions, subagents, compactions), enabling
listForRadar to fetch one row per agent instead of scanning log chunks.
Also fixes pre-existing Drizzle snapshot chain collision in meta/
(0035/0036 snapshots had wrong prevId due to parallel agent branches)
to unblock drizzle-kit generate.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
