feat(watchdogs): add experimental self-mode watchdogs

- Add enableWatchdogEverything experimental instance setting and UI toggle.
- Add issue_watchdogs.mode and accept mode in the watchdog endpoint.
- Wake task assignees directly for stopped self-mode watchdogs.
- Add first-instruction guidance for assignment-shaped wakes.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/src/migrations/0196_issue_watchdog_mode.sql

@@ -0,0 +1 @@
+ALTER TABLE "issue_watchdogs" ADD COLUMN IF NOT EXISTS "mode" text NOT NULL DEFAULT 'subtask';

packages/db/src/migrations/meta/_journal.json

@@ -1359,6 +1359,13 @@
       "when": 1785170000001,
       "tag": "0195_built_in_agent_unique_marker",
       "breakpoints": true
+    },
+    {
+      "idx": 196,
+      "version": "7",
+      "when": 1785170000002,
+      "tag": "0196_issue_watchdog_mode",
+      "breakpoints": true
     }
   ]
 }

packages/db/src/schema/issue_watchdogs.ts

@@ -14,6 +14,9 @@ export const issueWatchdogs = pgTable(
     watchdogAgentId: uuid("watchdog_agent_id").notNull().references(() => agents.id),
     instructions: text("instructions"),
     status: text("status").notNull().default("active"),
+    // "subtask" reviews stopped subtrees via a separate watchdog issue;
+    // "self" wakes the watchdog agent directly on the watched issue.
+    mode: text("mode").notNull().default("subtask"),
     watchdogIssueId: uuid("watchdog_issue_id").references(() => issues.id, { onDelete: "set null" }),
     lastObservedFingerprint: text("last_observed_fingerprint"),
     lastReviewedFingerprint: text("last_reviewed_fingerprint"),