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/shared/src/validators/issue.ts

@@ -31,6 +31,7 @@ export type CheckoutIssue = z.infer<typeof checkoutIssueSchema>;
 
 export const addIssueCommentSchema = z.object({
   body: z.string().min(1),
+  reopen: z.boolean().optional(),
 });
 
 export type AddIssueComment = z.infer<typeof addIssueCommentSchema>;