# Handoff Report — worker_remediation_server_and_tests

## 1. Observation
1. **Opcode Collision & Heuristic Hack in `server/gateway/ws_gateway_bridge.py`**:
   - Lines 41–51 previously defined:
     ```python
     OPCODE_PACKET_ENVELOPE = 0x0001
     OPCODE_PLAYER_MOVE_INPUT = 0x0002
     OPCODE_ENTITY_STATE = 0x0003
     OPCODE_ZONE_DATA = 0x0004
     OPCODE_CAST_MARTIAL_SKILL = 0x0010
     OPCODE_PHANTOM_EVASION = 0x0011
     OPCODE_COMBAT_DAMAGE_EVENT = 0x0012
     OPCODE_ENTER_ZONE_REQUEST = 0x0020
     OPCODE_ZONE_PORTAL_DATA = 0x0021
     OPCODE_CHAT_MESSAGE = 0x0030
     OPCODE_AUTH_REQUEST = 0x0050
     ```
   - Lines 159–183 attempted to resolve collision with an ad-hoc heuristic:
     ```python
     elif opcode == OPCODE_CAST_MARTIAL_SKILL: # 0x0010
         is_skill = True
         try:
             skill_req = combat_pb2.CastMartialSkillRequest.FromString(payload)
             if skill_req.skill_id == 0 and skill_req.caster_entity_id == 0:
                 try:
                     move_req = network_pb2.PlayerMoveInput.FromString(payload)
                     if move_req.entity_id != 0 or move_req.input_sequence != 0 or move_req.dir_x != 0:
                         is_skill = False
                 except Exception:
                     pass
         except Exception:
             is_skill = False
     ```
   - This conflicted directly with `client/cocos/assets/scripts/network/OpcodeRegistry.ts` (`PLAYER_MOVE_INPUT = 0x0010`, `CAST_MARTIAL_SKILL = 0x0020`, `ENTER_ZONE_REQ = 0x0030`) and `TEST_INFRA.md` line 60 (`0x0010 Move, 0x0011 WorldSync, 0x0020 Skill, 0x0022 Damage, 0x0030 Zone`).

2. **Deadzone Mathematics Discrepancy in `ws_gateway_bridge.py`**:
   - Line 95 previously evaluated:
     `is_halted = abs(input_x) < 0.001 and abs(input_y) < 0.001`
   - In `PROJECT.md` line 29, `TEST_INFRA.md` line 52, and `client/cocos/assets/scripts/core/KinematicsEngine.ts` line 59, the specified analog deadzone threshold is `mag <= 0.05`.

3. **Kinematics Velocity Calculation Bug in `client/cocos/assets/scripts/core/KinematicsEngine.ts`**:
   - Lines 114–117 previously updated:
     ```typescript
     this.wx = resolution.nextWx;
     this.wy = resolution.nextWy;
     this.velX = (resolution.nextWx - this.wx) / dt;
     this.velY = (resolution.nextWy - this.wy) / dt;
     ```
   - Because `this.wx` was updated to `resolution.nextWx` prior to difference calculation, `(resolution.nextWx - this.wx)` always evaluated to `0.0`.

4. **Tautological Assertions in `tests/e2e_cocos/test_tier4_human_player_journey.py`**:
   - Previous lines asserted local variable mutations:
     * Line 124: `active_modal = "MODAL_CRAFTING_FORGE"; assert active_modal == "MODAL_CRAFTING_FORGE"`
     * Line 132: `dummy_hp = 80000; dummy_hp -= 150; dummy_hp -= 280; dummy_hp -= 450; assert dummy_hp == 79120`
     * Line 168: `gate = {"state": 0, "packs_killed": 0, "required": 3}; for _ in range(3): gate["packs_killed"] += 1; if gate["packs_killed"] >= gate["required"]: gate["state"] = 1; assert gate["state"] == 1`
     * Line 185: `boss_hp = 18500; boss_hp -= 18500; assert boss_hp <= 0`
     * Line 237: `boss_defeated = True; assert boss_defeated is True`

5. **Test Verification Outputs Post-Remediation**:
   - Unit tests: `pytest tests/unit/test_ws_protobuf_gateway.py -v` -> 8 passed in 0.92s.
   - E2E tests: `pytest tests/e2e_cocos/ -v` -> 178 passed in 0.71s.
   - TypeScript build: `npx tsc --noEmit` in `client/cocos` -> 0 errors.
   - Code & Doc Hygiene: `python tools/lint/check_code_and_doc_hygiene.py` -> 0 hard cap violations.
     * `server/gateway/ws_gateway_bridge.py`: 317 lines (<= 350 soft cap).
     * `tests/unit/test_ws_protobuf_gateway.py`: 280 lines (<= 350 soft cap).
     * `tests/e2e_cocos/test_tier4_human_player_journey.py`: 325 lines (<= 350 soft cap).
     * `client/cocos/assets/scripts/core/KinematicsEngine.ts`: 146 lines (<= 350 soft cap).

---

## 2. Logic Chain
1. Based on Observation 1: Re-aligning the binary opcode table in `ws_gateway_bridge.py` to canonical values (`0x0010: PlayerMoveInput`, `0x0011: EntityState`, `0x0012: ZoneData`, `0x0020: CastMartialSkillRequest`, `0x0021: PhantomEvasionRequest`, `0x0022: CombatDamageEvent`, `0x0030: EnterZoneRequest`, `0x0031: ZonePortalData`, `0x0040: ChatMessage`, `0x0050: AuthRequest`) removes opcode collisions. With distinct opcodes, the heuristic check in `ws_gateway_bridge.py` lines 159–183 was completely removed, allowing deterministic packet routing directly to their Protobuf deserializers and responses.
2. Based on Observation 2: In `verify_zero_residual_momentum`, replacing `abs(input_x) < 0.001` with `math.hypot(input_x, input_y) <= 0.05` aligns server velocity snapping with the client's analog joystick deadzone specified in `PROJECT.md` and `TEST_INFRA.md`. Micro-drifts between 0.001 and 0.05 now halt instantly on both client and server.
3. Based on Observation 3: In `KinematicsEngine.ts`, storing `prevWx = this.wx` and `prevWy = this.wy` prior to assignment ensures `velX = (resolution.nextWx - prevWx) / dt` computes true velocity rather than collapsing to `0.0`.
4. Based on Observation 4: In `test_tier4_human_player_journey.py`, all local variable facades were replaced with genuine domain logic:
   - S1: Guest account creation tested via `server.auth.auth_service.AccountRepository` and `AccountStatus.ACTIVE`.
   - S2: Character creation tested via `server.auth.character_service.CharacterService.NAME_REGEX` and `Character` dataclass.
   - S3: Sanctuary placement verified through `ZoneEngine` (hostile spawns prohibited) and `MovementAuthorityEngine` / `WsGatewayBridge` zero-residual halt.
   - S4: NPC proximity and interaction verified through `NpcEngine` and `populate_canonical_npcs`, validating the `choice_open_forge` option triggering `NpcServiceType.CRAFTING_FORGE`.
   - S5: Combo DPS testing executed through `WsGatewayBridge` Protobuf encoding/decoding for `CastMartialSkillRequest` and immortal target dummy HP clamping.
   - S6: Dungeon entry tested through `ZoneEngine` open world status and waypoint Euclidean radius checks.
   - S7: Boss gate encounter progression verified through `ProceduralMapEngine.generate_wilderness_map`, checking `TileType.BOSS_GATE` transitioning from impassable to walkable via `ProceduralMapEngine().breach_boss_gate`.
   - S8: Boss execution and backpack pickup tested through `MonsterScalingEngine.create_monster_defense(level=18, rank=CombatantType.BOSS)` reducing boss current life to 0, followed by `simulated_player.add_to_inventory` slot insertion.
   - Full Symphony: Continuous 8-step journey chained end-to-end across authentic components.
5. Based on Observation 5: All 8 unit tests in `test_ws_protobuf_gateway.py` and all 178 tests in `tests/e2e_cocos/` pass 100%, TypeScript compilation passes cleanly, and all modified files remain strictly within the 350-line limit.

---

## 3. Caveats
- `server/proto` compiled Python and TypeScript modules were untouched as they were already verified correct.
- `tools/lint/check_code_and_doc_hygiene.py` reports soft cap warnings on older legacy files outside this worker's scope; all files touched by this worker are strictly <= 350 lines with 0 hard cap violations.

---

## 4. Conclusion
All defect remediation tasks assigned to `worker_remediation_server_and_tests` have been successfully completed:
1. `server/gateway/ws_gateway_bridge.py`: Binary opcodes harmonized, deadzone math updated to `math.hypot(input_x, input_y) <= 0.05`, and heuristic hack removed in favor of deterministic routing.
2. `client/cocos/assets/scripts/core/KinematicsEngine.ts`: Velocity displacement calculation bug corrected.
3. `tests/unit/test_ws_protobuf_gateway.py`: Framing assertions updated for opcode `0x0010` and analog deadzone checks added; all 8 tests pass.
4. `tests/e2e_cocos/test_tier4_human_player_journey.py`: All tautological and dummy test facades replaced with genuine domain components (`ZoneEngine`, `MovementAuthorityEngine`, `WsGatewayBridge`, `ProceduralMapEngine`, `NpcEngine`, `MonsterScalingEngine`, `CharacterService`, `AccountRepository`); all 18 tests pass.
5. Full E2E suite (`tests/e2e_cocos/`) passes 178/178 tests (100%).

---

## 5. Verification Method
To independently verify:
1. **Unit Tests**:
   ```bash
   pytest tests/unit/test_ws_protobuf_gateway.py -v
   ```
   *Expected*: 8 passed, 0 failed.
2. **E2E Cocos Test Suite**:
   ```bash
   pytest tests/e2e_cocos/ -v
   ```
   *Expected*: 178 passed, 0 failed.
3. **TypeScript Compilation**:
   ```bash
   cd client/cocos && npx tsc --noEmit
   ```
   *Expected*: Exit code 0, 0 type errors.
4. **Code Line Hygiene**:
   ```bash
   python tools/lint/check_code_and_doc_hygiene.py
   ```
   *Expected*: 0 Hard Cap violations. `ws_gateway_bridge.py` (317 lines), `test_ws_protobuf_gateway.py` (280 lines), and `test_tier4_human_player_journey.py` (325 lines) all <= 350 lines.