fix(windows): preserve current Rust UI codegen units

[proggeramlug]

Summary

• recognize current rustc .rcgu.o archive-member names when rebuilding Windows UI libraries
• keep allocator/non-codegen members excluded while extracting every UI codegen unit
• extend the COFF dedup regression fixture with a sibling .rlib whose member uses the current naming shape

Root cause

While validating the Windows event-pump fix for #6617, a real perry/ui compile failed with undefined perry_ui_* exports. Current rustc emits members such as perry_ui_windows-<hash>.<opaque>.<hash>.rcgu.o; the trimmer only recognized names containing literal .cgu. or -cgu., so it skipped all 16 UI objects after using their symbols to remove the staticlib copies.

Validation

• cargo test --profile perry-dev -p perry --bin perry coff_archive_dedup_drops_only_fully_provided_members -- --nocapture
• cargo test --profile perry-dev -p perry --bin perry rust_codegen_unit_recognizes_current_and_legacy_member_names
• cargo fmt --all -- --check
• git diff --check
• rebuilt perry-ui-windows for x86_64-pc-windows-msvc
• compiled a real TypeScript perry/ui app; the trimmer extracted 16/16 rlib CGUs and produced a 5.6 MB PE
• launched the resulting executable for two seconds; it remained alive in its Win32 message loop

No version bump.

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Review details

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Run ID: 215cddbe-6f84-44c7-a3b7-f6a756eba845

📥 Commits

Reviewing files that changed from the base of the PR and between 9863a98 and e69558b.

📒 Files selected for processing (2)

• changelog.d/8022-windows-ui-coff-exports.md
• crates/perry/src/commands/compile/strip_dedup.rs

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[proggeramlug]

Audited exact commit e69558b against current main. The .rcgu.o suffix is the correct discriminator for current and legacy rustc codegen-unit members while excluding lib.rmeta and ordinary bundled native objects. The sidecar-r​lib fixture exercises the corrected extraction path, the host-level predicate regression passes, formatting and diff checks are clean, and the current-main merge tree is conflict-free. No blocking findings.