gitignore meta-supervisor runtime state

The previous commit accidentally tracked .sf/meta-status.json + .sf/meta-supervisor.pid (transient runtime files written by scripts/sf-meta-supervisor.mjs each tick). Mirror the existing .sf/runtime/ ignore pattern for these top-level meta-* files; the daemon keeps writing them on disk but git no longer tracks the churn.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -135,3 +135,9 @@ repowise.db
 # `latest` is a symlink retargeted on every dispatch — pure git noise.
 .sf/traces/latest
 test_output.log
+
+# Meta-supervisor runtime state (written by scripts/sf-meta-supervisor.mjs).
+.sf/meta-status.json
+.sf/meta-supervisor.pid
+.sf/meta-supervisor.halt
+.sf/meta-supervisor.log

.sf/meta-status.json

@@ -1,17 +0,0 @@
-{
-  "schemaVersion": 1,
-  "updatedAt": "2026-05-17T12:07:57.090Z",
-  "sessionStartAt": "2026-05-17T11:53:54.674Z",
-  "metaSupervisorPid": 2520280,
-  "tickSeconds": 60,
-  "watchdog": {
-    "alive": true,
-    "pid": 2502396,
-    "restartsThisSession": 0
-  },
-  "drift": {
-    "cyclesWithNoUnitCompletion": 1,
-    "lastCompletionAt": "2026-05-17T12:06:39.259Z"
-  },
-  "lastNote": "ok"
-}

.sf/meta-supervisor.pid

@@ -1 +0,0 @@
-2520280