docs(specs): record xce-node-manager interactions with service and provisioning specs

xce-node-manager: a "Cross-Spec Interactions" section (pending a
requirements revision; approved criteria unchanged) with six points: a
supervision/probe module shared with service-supervision, node-manager
components vs service jobs, a lease-based provisioner role, role
declaration and worker stop on decommission for provisioned hosts, a
host-loss grace period longer than worker restart plus rejoin, and a future
service proxy under the reverse-proxy role. design.md Open Questions points
to it.

The service-supervision, host-failure-job-recovery, elastic-hosts,
resource-provisioner and service-endpoint briefs cross-reference the
matching points; the roadmap lists the xce-node-manager revision.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.kiro/specs/xce-node-manager/requirements.md

@@ -99,3 +99,49 @@ Open design questions to resolve during requirements/design phases (do not assum
 1. Where existing deployment tooling documents starting the Controller, Scheduler Process, Worker Process, or Apiserver Process as an independent, manually-managed process, that tooling shall be updated to reflect that the Node Manager now starts these components according to each node's assigned role.
 2. Where an existing spec or test tooling depends on a component being started or managed independently of the Node Manager, that dependency shall be identified and reconciled with this feature's behavior rather than left silently incompatible.
 3. The observable behavior of the Controller, Scheduler Process, Worker Process, and Apiserver Process toward jobs, queues, configuration, and cluster membership shall remain unchanged by this feature while each is running.
+
+## Cross-Spec Interactions (2026-10-10, pending requirements revision)
+
+Recorded during the long-running services and auto resource provisioning
+discoveries (`.kiro/steering/roadmap.md`). These are **not yet acceptance
+criteria**: the approved requirements and design above are unchanged until a
+revision (`/kiro-spec-requirements xce-node-manager`) folds them in or
+rejects them.
+
+1. **Two supervision layers, shared mechanics.** The Node Manager supervises
+   XCE's own components; the worker supervises user jobs, including service
+   replicas (`service-supervision`). The Node Manager never supervises job
+   processes (consistent with Requirement 5). Restart policy with backoff,
+   give-up rule and probes (the Node Manager's TCP port check, the worker's
+   command/TCP/HTTP probes) should come from one shared supervision/probe
+   module so their semantics match.
+2. **Infrastructure services boundary.** The Node Manager runs what XCE
+   itself needs, or what must run before or without a Controller (XCE
+   components, the reverse proxy). Everything else, including admin
+   infrastructure services such as license servers or monitoring agents,
+   runs as XCE service jobs (`service-replica-set`), scheduled with quotas,
+   RBAC and accounting.
+3. **Roles for lease-based components.** `resource-provisioner` adds a
+   daemon: the Node Manager needs a `provisioner` role that only keeps the
+   process running; which instance is active is decided by a
+   Controller-granted lease, not by the Node Manager (unlike the Scheduler's
+   primary-bound start/stop). Future XCE daemons should follow the same
+   "role + lease" pattern.
+4. **Provisioned hosts and decommission** (`elastic-hosts`). A cloud-burst
+   host boots with the Node Manager and the `worker` role, declared by its
+   host template and written into the Node Manager's configuration by the
+   instance's boot script (one concrete answer to "how a node's role
+   assignment is declared"). On decommission, the Node Manager must stop
+   the worker on that node (or drop its role) instead of restarting it, and
+   the Controller refuses a rejoin from a decommissioned host.
+5. **Worker restart vs. host loss** (`host-failure-job-recovery`). Jobs run
+   in systemd units and survive a worker daemon restart; the restarted
+   worker re-reports them on rejoin. The host-loss grace period must exceed
+   the Node Manager's worker restart plus rejoin time, so a worker crash
+   never requeues or fails jobs (service replicas included). Optional: the
+   Node Manager reports "worker restarting" so the Controller does not start
+   the grace period.
+6. **Future service proxy** (`service-endpoint`). A service proxy or load
+   balancer, out of scope for `service-endpoint` v1, would naturally run
+   under the Node Manager's `reverse-proxy` role, its routing fed by the
+   endpoint table.