Add issue identifiers, activity run tracking, and migration inspection

Add issuePrefix/issueCounter to companies and issueNumber/identifier to issues
for human-readable issue IDs (e.g. PAP-42). Add runId to activity_log for
linking activity to heartbeat runs. Rework DB client to support migration
state inspection and interactive pending migration prompts at startup.
Add reopen option to issue comments validator.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/db/src/schema/activity_log.ts

@@ -1,6 +1,7 @@
 import { pgTable, uuid, text, timestamp, jsonb, index } from "drizzle-orm/pg-core";
 import { companies } from "./companies.js";
 import { agents } from "./agents.js";
+import { heartbeatRuns } from "./heartbeat_runs.js";
 
 export const activityLog = pgTable(
   "activity_log",
@@ -13,10 +14,13 @@ export const activityLog = pgTable(
     entityType: text("entity_type").notNull(),
     entityId: text("entity_id").notNull(),
     agentId: uuid("agent_id").references(() => agents.id),
+    runId: uuid("run_id").references(() => heartbeatRuns.id),
     details: jsonb("details").$type<Record<string, unknown>>(),
     createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
   },
   (table) => ({
     companyCreatedIdx: index("activity_log_company_created_idx").on(table.companyId, table.createdAt),
+    runIdIdx: index("activity_log_run_id_idx").on(table.runId),
+    entityIdx: index("activity_log_entity_type_id_idx").on(table.entityType, table.entityId),
   }),
 );