Update 2.127

v2.127.0.0BETAMINORSeymour

Capture Cascade Cap-1 Phase C: 1-byte `capturable` writer (`MonsterCaptureFlagWriter`) + `--monster-capture-bit-rt0` gate PASS 361/361 across the vanilla corpus

• (new capability: first writer for the Capture Cascade / Yoke of Spira feature; library + gate, still NO UI). Implements Phase C of the Cap-1 plan (Phase B v2.123.3.1 located the byte; Phase C writes to it). Writer (FFXProjectEditor/FfxLib/Monster/MonsterCaptureFlagWriter.cs): byte-level (no Monster_File.Read(...).Write() full struct round-trip), operates directly on bytes[StatSheetPointer + 0x78] with StatSheetPointer = uint32_le(bytes[0x0C]). API: TryGetStatSheetPointer, GetCaptureFlagFileOffset, ReadCaptureFlag, ReadPaddingByte, WriteCaptureFlag(monBin, newSlot) (clones the array, flips the byte, keeps padding 0x00, refuses monsters with non-zero padding as an unknown variant); helpers IsUncapturable/IsVanillaArenaSlot/IsSidecarArenaSlot. Constants Uncapturable = 0xFF, VanillaArenaSlotMin/Max = 0x00..0x67, SidecarArenaSlotMin/Max = 0x68..0xFE (vanilla MA = 104 slots, sidecar = Capture Cascade region with no bestiary collision). Gate (FFXProjectEditor/Tools/MonsterCaptureFlagRt0.cs): invoked via FFXProjectEditor.exe --monster-capture-bit-rt0 [monsterRoot], proves 3 properties per monster: (1) same-value byte-identity — WriteCaptureFlag(bin, current) == bin (writer is a no-op when newSlot==current); (2) slot-only diff — WriteCaptureFlag(bin, target) differs from bin in exactly 1 byte, at [StatSheetPointer + 0x78], with padding 0x00, every other byte byte-identical; (3) flip-and-restore RT0 — WriteCaptureFlag(WriteCaptureFlag(bin, target), original) == bin (full idempotence). Target is chosen out-of-band per category: uncap (0xFF) flips to 0x68 (sidecar), vanilla MA flips to 0xFF, etc. Result against FFX Extracted\...\jppc\battle\mon (vanilla): VERDICT PASS — 361/361 monsters, 251 uncap (0xFF), 110 vanilla MA slot, 0 sidecar, 0 non-zero padding, header parse 361/361, same-value RT0 361/361, slot-only diff 361/361, flip-and-restore RT0 361/361. Exceeds the 58-sample Phase B evidence corpus 6×. Wired into RuntimeTools/offline_ci.ps1 $editorGates (between monster and encounter) — permanent internal gate. New files: FfxLib/Monster/MonsterCaptureFlagWriter.cs, Tools/MonsterCaptureFlagRt0.cs. Touched: Program.cs (wired --monster-capture-bit-rt0), RuntimeTools/offline_ci.ps1 ($editorGates). Does not touch: m###.bin (gate is read-only — only reads vanilla files, never writes to disk), DLL, runtime, save, hook. C# Release build PASS (0 errors, 384 baseline warnings). Phase C UI not wired in this deliverable — still library + gate, no public button. Next safe step: Phase D (UI Capturable checkbox in MonEditor + bulk writer for Dark Aeons + Penance) or in-game RT2 (Halyson edits 1 disposable monster 0xFF→0x68 in a real m###.bin, saves, launches the game, captures the monster to confirm the engine accepts slot outside the vanilla 0x00..0x67 range). Doc: docs/reverse/FFX_SPIRA_REFORGE_CAPTURE_BIT_M_HEADER_RE_RESULT_2026-06-16.md §5.1

v2.126.0.0