v1.4: isolate Left layer 2761 occluder

[Datamining00]

Diagnostic goal

Temporarily exclude the exact decoded Left placement isolated by the layer probe to determine whether it is the visible black occluder.

Target signature in this diagnostic build only:

• section: Left
• source offset: 185644
• type: 1048677
• non-mask

Important

• This is not a production rendering rule.
• Parser output is unchanged.
• The existing section-boundary and compact-shape fixes stay enabled.
• No layer reversal or global order change is introduced.

Pass condition

If the same Left preview now matches the in-game image and the large black rectangle disappears, the occlusion is conclusively tied to this decoded placement. The next patch should then repair its actual group/draw-order semantics rather than permanently delete it.

Validation

• Windows CI: success
• Regression suite: 188 tests, OK
• PyInstaller one-file build: success
• EXE SHA-256: c3a2fd64b5303d6654f718980831b94a22f05593a47589946d7c5b017e214868
• Artifact ZIP SHA-256: 2f3254f8c4ca5d6451cbabae18bb1cb2a1ccafc75a00e826ae8b21fe016bf6cc

Draft until visual verification.