chore(meta): update changelog for PR #32 review fixes

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

CHANGELOG.md

@@ -6,6 +6,21 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+- `gauntlet` feature flag (default-on) — allows stripping Gauntlet test world from release builds with `--no-default-features`
+- `EXPECTED_ENTITY_COUNT` and `RESET_PLATE_STABLE_IDS` constants — entity counts derived from StableId ranges instead of hardcoded values
+- Debounce exact-boundary test for room reset (tick 9 rejected, tick 10 accepted)
+- Reset plate StableId verification in `stable_id_ranges_match_spec`
+- Runtime content test (`content_runtime.rs`) separated from structural loading tests
+
+### Changed
+- Room reset API consolidated to `plan_reset` only — `execute_reset` removed (was a maintenance trap; production uses Commands via `plan_reset`)
+- `room_at()` documented with z-range and corridor overlap assumptions
+- TCP runtime test now has 10s read timeout and registers player in EntityRegistry
+
+### Removed
+- Dead `RoomMember` component from reset.rs (defined but never used)
+
 ### Added
 - Protocol v8: dialogue_response field decoding (DialogueResponseEvent with line_id, text, speaker_entity_id) from server #305/D-028
 - Test client binary scaffolding (#480) — standalone crate at `tooling/test-client/` with CLI (--connect, --replay, --text, --json, --quiet, --golden, --ticks), exit codes (0/1/2), golden file JSON diff, JSONL replay loader