sdk: Reduce amalgamated C SDK source size by ~54%#5800

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dreveman wants to merge 26 commits into

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dev/reveman/shrink-c-sdk

Commits on May 15, 2026

amalgamated C SDK: drop unused per-domain trace pbzero headers
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amalgamated C SDK: drop per-domain config + common protos behind lazy fields
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amalgamated C SDK: drop chrome/etw/stress_test config protos behind lazy fields
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amalgamated C SDK: drop unused top-level trace protos
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amalgamated C SDK: drop sys_stats_counters from common protos
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amalgamated C SDK: drop C++ implementation files unused by the C ABI
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sdk: split protos/perfetto/common into minimal + non_minimal
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sdk: split protos/perfetto/config into minimal + non_minimal
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sdk: split protos/perfetto/trace/interned_data into minimal + lite_only
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sdk: split protos/perfetto/trace into core + extras + lite_only
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sdk: split src/base into :base_minimal core + :base full
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sdk: split src/tracing client_api into _minimal core + extras
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sdk: add :tracing_minimal sibling in include/perfetto/tracing
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sdk: trace BUILD.gn: reverse non_minimal core/extras dep edge
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sdk: switch C SDK closure to _minimal deps and remove the GN arg
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sdk: restructure trace cpp generation to drop per-domain leak
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sdk: add :core_minimal siblings + plumb minimal across src/tracing
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sdk: close remaining C SDK leak paths through service + ipc layers
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sdk: presubmit fixups for the C SDK shrink stack
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sdk: split interned_data cpp generation into its own full-deps library
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sdk: fix bazel build by retargeting trace non_minimal proto group
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sdk: rename interned_data minimal_@TYPE@ back to canonical @TYPE@
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