refactor: consolidate dwarf read planning#149
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Move DWARF variable access to PC-context read plans, making ghostscope-dwarf own scope selection, access paths, availability, and lowering requirements before compiler codegen. Route compiler variable reads through planned locations and remove raw evaluation adapters from the compiler-facing path. Reject unsafe fallbacks for shadowed variables, ambiguous globals, and value-backed aggregate member offsets. Preserve optimized-out print metadata, keep link-time addresses rebased, and cover optimized variables, member access, and address trace failures. Refs #148.
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Move DWARF variable access to PC-context read plans, making ghostscope-dwarf own scope selection, access paths, availability, and lowering requirements before compiler codegen.
Route compiler variable reads through planned locations and remove raw evaluation adapters from the compiler-facing path. Reject unsafe fallbacks for shadowed variables, ambiguous globals, and value-backed aggregate member offsets.
Preserve optimized-out print metadata, keep link-time addresses rebased, and cover optimized variables, member access, and address trace failures.
Refs #148.