feat(runtime): sync experience bus and learner stack into main

migrations/055_agent_lessons.sql

@@ -0,0 +1,27 @@
+-- Phase-2: Experience Learner lessons store (append-only)
+
+CREATE TABLE IF NOT EXISTS agent_lessons (
+    id BIGSERIAL PRIMARY KEY,
+    lesson_id UUID NOT NULL UNIQUE,
+    lesson_key TEXT NOT NULL UNIQUE,
+    ts TIMESTAMPTZ NOT NULL,
+    scope TEXT NOT NULL,
+    agent_id TEXT NULL,
+    task_type TEXT NOT NULL,
+    trigger TEXT NOT NULL,
+    action TEXT NOT NULL,
+    avoid TEXT NOT NULL,
+    signals JSONB NOT NULL,
+    evidence JSONB NOT NULL,
+    raw JSONB NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_agent_lessons_scope_ts
+    ON agent_lessons (scope, ts DESC);
+
+CREATE INDEX IF NOT EXISTS idx_agent_lessons_agent_ts
+    ON agent_lessons (agent_id, ts DESC);
+
+CREATE INDEX IF NOT EXISTS idx_agent_lessons_task_ts
+    ON agent_lessons (task_type, ts DESC);