feat(reconcile): reprovision CA, git-gate, and egress tokens on gateway bring-up (PRD 0081)

On a gateway cold boot, reconcile every live agent VM against the fresh
gateway: push the new CA into each agent's trust store, re-provision
git-gate repos/creds from the persisted upstreams snapshot, and restore
egress tokens. Per-bottle failures are logged and skipped rather than
aborting the whole reconcile.

New: reconcile.py — attach_bottled_agents_to_gateway, _push_ca,
_reprovision_git_gate, _guest_ip_from_config.

New: git_gate/provision.py writes upstreams.json after key provisioning
so the bring-up reconcile can reconstruct the upstream table without the
manifest.

Wired into FirecrackerInfraService.ensure_running() cold-boot path;
base.py BottleBackend gets a no-op default. Old _reprovision_running_bottles
removed from consolidated_launch.py (superseded by reconcile.py). Tests
migrated and extended.

bot_bottle/backend/firecracker/infra.py

@@ -17,6 +17,7 @@ from ...orchestrator.lifecycle import DEFAULT_STARTUP_TIMEOUT_SECONDS
 from . import infra_vm
 from .gateway import FirecrackerGateway
 from .orchestrator import FirecrackerOrchestrator
+from .reconcile import attach_bottled_agents_to_gateway
 
 
 class FirecrackerInfraService(InfraService):
@@ -67,9 +68,11 @@ class FirecrackerInfraService(InfraService):
             # holds the signing key) mints the role-scoped `gateway` JWT for the
             # gateway, which never sees the key (#469).
             orchestrator.ensure_running(startup_timeout=startup_timeout)
-            self.gateway().connect_to_orchestrator(
+            gateway = self.gateway()
+            gateway.connect_to_orchestrator(
                 orchestrator.gateway_url(), orchestrator.mint_gateway_token())
             infra_vm.record_booted_version(want)
+            attach_bottled_agents_to_gateway(url, gateway)
             return url
 
     def stop(self) -> None: