Changes to steamworks/structs.py:
- Added _pack_ = 4 to all structs to match Steamworks SDK alignment (#pragma pack(push, 4))
- Fixed FindLeaderboardResult_t.leaderboardFound: c_uint32 -> c_uint8 (matches SDK definition)
- Added new fields to ItemInstalled_t: legacyContent (c_uint64) and manifestId (c_uint64) for SDK 1.64

This fixes field offset mismatches on Linux/Mac and ensures structs match the SDK 1.64 ABI.
Struct sizes verified: ItemInstalled_t=28, FindLeaderboardResult_t=12, SubscriptionResult=12

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

RequestCurrentStats was removed from the Steamworks SDK (deprecated and removed).
Removed from both the STEAMWORKS_METHODS dict and the SteamUserStats interface class.

Files modified:
- steamworks/methods.py: Removed RequestCurrentStats from STEAMWORKS_METHODS
- steamworks/interfaces/userstats.py: Removed RequestCurrentStats() method

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

This commit implements three compatibility fixes for Steamworks SDK 1.64:

1. Remove automatic RequestCurrentStats() call
   - Removed from SteamInit() initialization (SDK 1.64 calls this automatically)
   - Removed standalone RequestCurrentStats() wrapper function

2. Fix GetAuthSessionTicket signature
   - Added NULL parameter for new pSteamNetworkingIdentity argument
   - Function signature changed in SDK 1.64

3. Update deprecated Controller type names to Input types
   - ControllerHandle_t → InputHandle_t (5 occurrences)
   - ControllerDigitalActionHandle_t → InputDigitalActionHandle_t (1 occurrence)
   - These are typedef aliases to the same uint64 type, purely cosmetic update

All changes maintain backward compatibility with existing Python wrapper.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Python 3.14 warns when _pack_ is set without _layout_ on
non-Windows platforms. Becomes an error in Python 3.19.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>