fix(supervise): resolve approval target by bottle_id, not human slug

In consolidated mode the supervise server attributes each proposal to
the orchestrator-assigned bottle_id and stores that as the proposal's
`bottle_slug` (supervise_server `_attributed_config`). But
`_record_for_slug` only scanned registry metadata for a matching human
slug, so approving an egress proposal 409'd with "bottle <id> is no
longer registered; cannot apply the route change" — the id never
matched a human slug.

Resolve the record by bottle_id first (the consolidated reality),
keeping the metadata-slug scan as a fallback for legacy single-tenant
proposals. The prior tests keyed proposals by the human slug matching
the metadata, exercising only the fallback path — added a test that
mirrors production (proposal keyed by bottle_id, distinct human slug in
metadata).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UoEZHDjv84ChoZbozQERhJ

bot_bottle/orchestrator/service.py

@@ -157,8 +157,17 @@ class Orchestrator:
         return [p.to_dict() for p in list_all_pending_proposals()]
 
     def _record_for_slug(self, slug: str) -> BottleRecord | None:
-        """The live registry record whose metadata carries `slug`, or None
-        (e.g. the bottle was torn down before the operator responded)."""
+        """The live registry record for a proposal's bottle, or None (e.g. the
+        bottle was torn down before the operator responded).
+
+        In consolidated mode the supervise server attributes each proposal to
+        the orchestrator-assigned bottle_id and stores that as the proposal's
+        `bottle_slug` (see supervise_server `_attributed_config`), so the fast
+        path is a direct bottle_id lookup. The metadata-slug scan is the
+        fallback for legacy single-tenant proposals keyed by the human slug."""
+        rec = self.registry.get(slug)
+        if rec is not None:
+            return rec
         for rec in self.registry.all():
             try:
                 meta = json.loads(rec.metadata) if rec.metadata else {}