Add Wine runtime smoke test helper

docs/migration.md

@@ -58,6 +58,54 @@ delivery gradually, not through a single risky cutover.
 6. Validate asset loads in logs and in-game.
 7. Move to the next pack group.
 
+## Confirmed startup-safe pack group
+
+The following startup pack set has already been validated against the real
+client runtime on the Linux VPS:
+
+- `root`
+- `patch1`
+- `patch2`
+- `season3_eu`
+- `metin2_patch_snow`
+- `metin2_patch_snow_dungeon`
+- `metin2_patch_etc_costume1`
+- `metin2_patch_pet1`
+- `metin2_patch_pet2`
+- `metin2_patch_ramadan_costume`
+- `metin2_patch_flame`
+- `metin2_patch_flame_dungeon`
+- `locale`
+- `uiscript`
+- `uiloading`
+- `ETC`
+- `item`
+- `effect`
+- `icon`
+- `property`
+
+Validation method:
+
+1. build each pack as `.m2p`
+2. remove the matching legacy `.pck`
+3. provide the runtime master key through:
+   - `M2PACK_MASTER_KEY_HEX`
+   - `M2PACK_KEY_ID=1`
+4. start the Linux-built Windows client with `xvfb-run + wine`
+
+Observed result:
+
+- `PackInitialize` succeeded
+- Python startup succeeded
+- `app.Create(...)` succeeded
+- client reached `MainStream.SetLoginPhase()`
+
+Recommended next pack groups:
+
+1. remaining startup-adjacent patch packs
+2. world and map content such as outdoor, terrain, tree, and zone
+3. late-load gameplay content such as pc, npc, monster, and sound
+
 ## Risk notes
 
 - Do not mix silent fallback with production security claims.