fix(simulation): address PR #37 review — doc corrections, race fix, marker cleanup

Hoshe review (4 items):
- types.rs: doc comment "Current: 6" → "Current: 9"
- dialogue.rs: walk-away doc duplicated numbering (items 4-5 were 2-3)
- test_world/mod.rs: comment "Reset plates at 49-51" → "49-55"
- content_scaling.rs: magic number 51 → constants::RESET_PLATE_STABLE_IDS.1

Tyre review (3 items):
- knowledge/types.rs: guard comments on decrement() floor at Hostile
- input.rs: TeleportToHub now clears ConfrontationDelivered marker
- content_scaling.rs: same magic number fix (covered above)

Additional:
- content_runtime.rs: barrier-based shutdown handshake fixes TCP RST
  race condition under parallel test execution
- dialogue_room.rs: clippy type_complexity allow on NPCS tuple array

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/simulation/dialogue.rs

@@ -498,8 +498,8 @@ pub fn process_talk_interaction(
 /// 1. Target NPC shifts to AnimationTier::Tier2 (D-047 ambiguous animation)
 /// 2. NPC routine deviation recorded (storyteller hook)
 /// 3. Emits IncompleteInteraction knowledge event (recorded in KG)
-/// 2. Clears ActiveDialogue state
-/// 3. Removes the WalkAwayRequest marker
+/// 4. Clears ActiveDialogue state
+/// 5. Removes the WalkAwayRequest marker
 ///
 /// If no ActiveDialogue is present, removes WalkAwayRequest silently (no-op).
 ///