fix: use VirtualSize instead of SizeOfRawData for Windows PE .bun section

[taocihei]

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Problem

vpcc patch fails on Windows PE builds with:
fail [bun-inplace] Bun trailer invalid - format change
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Root Cause

On Windows PE builds, .bun section has:

• VirtualSize = 131,532,925 bytes (actual data)
• SizeOfRawData = 131,533,312 bytes (+387 bytes file-alignment padding)

Current code uses rsize or vsize, causing bun_hi to land inside trailing NUL padding. Trailer validation reads \x00 bytes instead of the real trailer and fails.

Fix

Change section size resolution to prioritize VirtualSize:

return (raw_off, vsize or rsize)
Verification
Tested on Claude Code 2.1.119 Windows build:
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95 ok · 0 failed · 0 skipped

[VoidChecksum]

Thanks for the fix! The same change landed via #17 (commit 663433e on 2026-04-29) — your branch is now in conflict because both branches modified the same line. Current main has (raw_off, vsize or rsize) in _find_bun_section_pe exactly as you proposed. Closing as superseded. Appreciate the diagnosis and root-cause writeup.