feat(backend): reconcile running bottles' CA on gateway bring-up (0081)

Add `attach_bottled_agents_to_gateway()` as an `@abc.abstractmethod` on
`BottleBackend` and implement the first reconcile step across all three
backends: on a gateway cold boot, replace every already-running agent's
trusted CA with the freshly-minted gateway CA. Reconciling running bottles
is a backend responsibility (only the backend can enumerate its agents and
reach them — firecracker over SSH, docker/macOS over exec/cp), so making it
an abstract method keeps the fix cross-backend by construction.

The gateway rootfs is ephemeral, so a rebuild mints a new CA that every
running bottle distrusts (SSL verification fails — #510). This reconcile is
what distributes the fresh CA, so a routine gateway rebuild now doubles as a
free CA rotation. Per-bottle steps are best-effort: one unreachable or
malformed bottle is logged and skipped, never blocking the others.

Trigger — `Gateway.connect_to_orchestrator` now returns a cold-boot bool
(True when it actually (re)brought the gateway up, False when a healthy
current gateway was left untouched); each infra `ensure_running` gates the
reconcile on it, so it fires exactly on cold boot and never on an adopt.

Git-gate re-provision and egress-token restore fold into this same reconcile
on the same trigger in follow-up PRs (#516).

Refs #516. Addresses #510.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

bot_bottle/backend/docker/infra.py

@@ -142,9 +142,16 @@ class DockerInfraService(InfraService):
         # mints the role-scoped `gateway` JWT here and hands it to the gateway,
         # which never sees the key (#469). `connect_to_orchestrator` is
         # idempotent.
-        gateway.connect_to_orchestrator(
+        cold_booted = gateway.connect_to_orchestrator(
             orchestrator.gateway_url(), orchestrator.mint_gateway_token(),
         )
+        # A (re)created gateway container minted/mounted its CA afresh and lost
+        # every bottle's per-bottle state; reconcile the already-running bottles
+        # against it (PRD 0081). Skipped when a healthy current gateway was left
+        # untouched — no cold boot, nothing to reconcile.
+        if cold_booted:
+            from .backend import DockerBottleBackend
+            DockerBottleBackend().attach_bottled_agents_to_gateway()
         return orchestrator.url()
 
     def stop(self) -> None: