cl loadTypedef: fix TypeIgnore; cmd/llcppg: support subPkgs

[xushiwei]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.36%. Comparing base (a91158e) to head (1947404).
⚠️ Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
cl/type.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #879      +/-   ##
==========================================
+ Coverage   87.32%   88.36%   +1.04%     
==========================================
  Files          22       22              
  Lines        1878     1857      -21     
==========================================
+ Hits         1640     1641       +1     
+ Misses        238      216      -22     

Flag	Coverage Δ
llgo-tests	88.36% <80.00%> (+1.04%)	⬆️

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[fennoai]

Review summary

This PR moves Gen from tool/gen.go into cmd/llcppg/gen.go and adds sub-package generation (Pkgs + Apply + genPkg/convPkg), refines the block-pointer log message, switches typedef ignore matching to the trimmed local name, and fixes config comments.

The core refactor is sound: the expensive clang.Index is correctly shared across sub-packages, gogen.GeneratedHeader is restored via defer, and trimTypeTag now normalizes tagged C names consistently with the rest of cl. No performance concerns.

The findings below are about robustness and consistency in the new sub-package path plus a comment accuracy nit. None are blocking.

Additional findings

• tool/config.go:69: [P3] Document (and consider validating) Apply's selective field inheritance: Apply inherits only Language, Stdlib, LLGoPackage, CFlags, and Deps from the parent; TypeIgnore, Rename, the *Prefix fields, TypeAbbr, Class/NonClass, NSIgnore, and Dir/Files are not. If this selective inheritance is intentional, a doc comment on Apply listing which fields are inherited (and why the rest are excluded) would prevent future "bug or feature?" confusion.