CI: remove k8s stages, fix the Docker-level pipeline green

Survey + fixes so the pipeline passes at the Docker level (no k8s).

- Remove k8s: drop the `sandbox-k8s` job (kind/Calico/--features k8s-tests) and the
  "Helm chart lints" gate step. release.yml was already k8s-clean.
- Rust job:
  - `cargo fmt --all` — fix pre-existing formatting drift (fmt --check was failing).
  - clippy -D warnings: fix 3 lib warnings (cm-brain sort_by_key→Reverse, cm-api
    fleet.rs doc list indentation, node_rules map_or→is_none_or).
  - Regenerate the .sqlx offline cache (was missing the cm-runtime run_loop test
    query → offline compile failed). DB-backed tests use testcontainers at runtime.
  - Set SQLX_OFFLINE=true on the rust + e2e jobs so query! macros compile against
    the committed cache deterministically (no DB needed at compile time).
- Frontend job:
  - Fix the 1 ESLint error (useAgentTelemetry: no setState-synchronously-in-effect;
    tag the slice with agentId + derive null on mismatch).
  - Fix 2 stale panel-params tests (`terminal` is a valid app id now; assert the
    current APP_IDS + use a genuinely-unknown id for the reject case).

Verified locally: fmt clean, clippy --all-targets -D warnings clean (offline),
frontend lint 0 errors, tsc clean, 86/86 frontend tests pass, build OK.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

crates/cm-scheduler/src/lib.rs

@@ -36,8 +36,16 @@ impl Scheduler {
             // Reschedule first: a firing failure must not stall the clock. A
             // one-shot routine (Scheduled mode, a specific date/time) fires once
             // and never reschedules.
-            let one_shot = routine.action.get("one_shot").and_then(|v| v.as_bool()).unwrap_or(false);
-            let next = if one_shot { None } else { next_occurrence(&routine.schedule_cron, now).ok() };
+            let one_shot = routine
+                .action
+                .get("one_shot")
+                .and_then(|v| v.as_bool())
+                .unwrap_or(false);
+            let next = if one_shot {
+                None
+            } else {
+                next_occurrence(&routine.schedule_cron, now).ok()
+            };
             routines::set_next_run(&self.pool, routine.id, next).await?;
 
             let agent_id = cm_domain::AgentId::from(routine.agent_id);