Add Experience V1 schema migration and agent-run completion extractor.

Extend h5_experience with structured fields, wire mindspace-agent-runner and agent-run-gateway to persist task_outcome records with provenance, and add local migration and verification scripts.

Co-authored-by: Cursor <cursoragent@cursor.com>

schema.sql

@@ -1311,9 +1311,20 @@ CREATE TABLE IF NOT EXISTS h5_experience (
   source_user_id CHAR(36) NULL,
   use_count BIGINT NOT NULL DEFAULT 0,
   embedding JSON NULL,
+  problem VARCHAR(512) NULL,
+  environment_json JSON NULL,
+  hypothesis VARCHAR(512) NULL,
+  action_json JSON NULL,
+  result ENUM('success','partial','failure','unknown') NULL,
+  confidence DECIMAL(4,3) NULL,
+  evidence_json JSON NULL,
+  parent_experience_id CHAR(36) NULL,
+  supersedes_id CHAR(36) NULL,
+  status ENUM('active','archived','deleted') NOT NULL DEFAULT 'active',
   created_at BIGINT NOT NULL,
   updated_at BIGINT NOT NULL,
   KEY idx_h5_experience_scope_updated (scope, updated_at),
+  KEY idx_h5_experience_status_updated (status, updated_at),
   FULLTEXT KEY ftx_h5_experience (title, body)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;