chore(deps): rand 0.9.4 + compatible sweep + serde_yaml→serde_norway (#966)

Focused Rust dependency-maintenance pass from the 2026-05-23 security/freshness
review. No CVEs; one advisory cleared and one deprecated crate replaced.

- rand 0.9.2 → 0.9.4 (lockfile): clears RUSTSEC-2026-0097 (unsound with a
  custom logger using rand::rng()). Semver-compatible; rand 0.10 is a separate
  major.
- Compatible-update sweep: ~90 lockfile-only patch/minor bumps (bevy 0.18.0→
  0.18.1, clap 4.5→4.6, rayon 1.11→1.12, pathfinding 4.14→4.15, uuid 1.20→1.23,
  zerocopy, serde_json, tracing-subscriber, etc.). cargo test green.
- serde_yaml 0.9 (deprecated/archived upstream) → serde_norway 0.9, an actively
  maintained drop-in fork. In the server it is test-only (poi.rs round-trip,
  trait_modifiers.rs fixture, tests/news_ticker.rs) so it moves to
  dev-dependencies; line-previewer parses dialogue/monologue pool YAML at
  runtime, so it keeps it as a normal dependency. API is identical (from_str/
  to_string).

news_ticker.rs also picks up its share of the #967 clippy sweep (HashSet/HashMap
→ BTree, doc-list indent) since it is the same file as the serde rename.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/src/simulation/poi.rs

@@ -205,8 +205,9 @@ mod tests {
     #[test]
     fn poi_serialization_roundtrip() {
         let poi = make_poi("med_bay", PoiCategory::Service, PoiVisibility::LineOfSight);
-        let serialized = serde_yaml::to_string(&poi).expect("serialize");
-        let deserialized: PointOfInterest = serde_yaml::from_str(&serialized).expect("deserialize");
+        let serialized = serde_norway::to_string(&poi).expect("serialize");
+        let deserialized: PointOfInterest =
+            serde_norway::from_str(&serialized).expect("deserialize");
         assert_eq!(deserialized.poi_id, "med_bay");
         assert_eq!(deserialized.category, PoiCategory::Service);
     }