Add MPQ archive file cache: skip redundant chain walks on repeat file opens

Hook File_FindInArchive (0x6549a0) with a direct-mapped filename-verified
cache. First open does the full MPQ chain walk (~60K cycles), subsequent
opens hit the cache (~300 cycles). 80% hit rate in gameplay testing.

Cache design: 16384 entries, FNV-1a hash for slot index, raw filename
comparison (128 bytes) for collision safety. Stores outer_archive,
inner_archive, and block_entry per file. Negative cache for not-found files.
Refcount at +0x38 incremented on all output archives to match original
File_FindInArchive behavior (verified via Ghidra: FindAndIncrementResourceReference
at 0x650780, DecrementResourceReference at 0x6507e0).

Also: default build changed to ReleaseFast (works around Zig fastcall inreg
bug in Debug mode), logging gate changed to != ReleaseSmall, file cache
integrated as transform44 sub-module with A/B comparison timing in readout.

src/addons.zig

@@ -267,7 +267,7 @@ const all_prefixes = buildAllPrefixes();
 var active_prefixes: [all_prefixes.len]*const AddonPrefix = undefined;
 var active_count: usize = 0;
 
-fn pruneInactivePrefixes() void {
+pub fn pruneInactivePrefixes() void {
     active_count = 0;
     for (all_prefixes) |*prefix| {
         const active = if (prefix.module_name) |mod_name| module_active.isActive(mod_name) else true;