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/companies.rs

@@ -136,7 +136,12 @@ pub async fn patch_company(
         .collect();
     let n = by_node.len();
     let roles: Vec<String> = (0..n)
-        .map(|i| by_node.get(&format!("n{i}")).map(|(_, r)| r.clone()).unwrap_or_else(|| "team".into()))
+        .map(|i| {
+            by_node
+                .get(&format!("n{i}"))
+                .map(|(_, r)| r.clone())
+                .unwrap_or_else(|| "team".into())
+        })
         .collect();
     let role_refs: Vec<&str> = roles.iter().map(String::as_str).collect();
     let mut graph = build(kind, &role_refs).map_err(|_| ApiError::BadRequest)?;
@@ -147,7 +152,14 @@ pub async fn patch_company(
         }
     }
     let graph_json = serde_json::to_value(&graph).map_err(|_| ApiError::Internal)?;
-    cm_db::repo::companies::set_topology(&state.pool, company.id, user.workspace_id, kind.as_str(), &graph_json).await?;
+    cm_db::repo::companies::set_topology(
+        &state.pool,
+        company.id,
+        user.workspace_id,
+        kind.as_str(),
+        &graph_json,
+    )
+    .await?;
     Ok(StatusCode::NO_CONTENT)
 }