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-api/src/routes/planner.rs

@@ -61,7 +61,8 @@ brain_query to a concrete domain brain keyword (e.g. 'rust-2024', 'react-native'
 const SCHEDULED_NOTE: &str = "\n\nMODE: Scheduled. Include a schedule in the proposal. Recurring: \
 {\"cron\":\"<5-field>\",\"prompt\":\"<mission run each cycle>\"}. One-time: \
 {\"one_shot_at\":\"<RFC3339 UTC datetime>\",\"prompt\":\"<mission>\"}.";
-const TRIGGERED_NOTE: &str = "\n\nMODE: Triggered. The team will be fired by a webhook on demand. Set the \
+const TRIGGERED_NOTE: &str =
+    "\n\nMODE: Triggered. The team will be fired by a webhook on demand. Set the \
 schedule field to {\"prompt\":\"<the default task the webhook runs>\"} (NO cron / one_shot_at).";
 const SWARM_SYSTEM: &str = "You are the planner for a self-verifying agent SWARM (Opus plans + verifies, a worker \
 swarm executes, the loop repeats until every output passes). The user describes a job; you turn it into a swarm \