* Add symbol kind to diff proto output
Expose SymbolKind (Function, Object, Section, Unknown) in the
DiffSymbol proto message, allowing CLI oneshot diff consumers to
distinguish symbol types without inferring from instruction/data
presence.
* Stop filtering symbols from diff output, replace flags bitmask with message
Remove the symbol filter (size == 0 / Ignored) from DiffObject so all
symbols are emitted. This fixes target_symbol indices being invalid
after filtering.
Replace the DiffSymbolFlag bitmask enum + uint32 field with a
DiffSymbolFlags message of booleans, adding ignored and size_inferred
flags so consumers can filter on their end.
This has been unimplemented since v3.0.0-alpha.1,
and I don't currently have plans to bring it back.
If you need it for something, please open an issue!