feat: add the tracegrind tool#8

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art049 wants to merge 26 commits intomasterfrom

tracegrind-tool

Commits on Feb 6, 2026

feat: fork callgrind as tracegrind (mechanical rename)

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feat: replace callgraph dump with streaming CSV trace output

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feat: add MsgPack+LZ4 output format for tracegrind

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feat: discriminated union schema for msgpack, drop CSV format

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feat(bench): add tracegrind benchmarks for comparison with callgrind

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fix(bench): skip tracegrind tests when tool not available

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feat: add MARKER event type and remove legacy dump infrastructure

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refactor: remove dead callgrind remnants from tracegrind

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refactor: remove --fn-skip, --obj-skip, and --skip-direct-rec options

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feat(tracegrind): add regression tests and CI integration

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Commits on Feb 7, 2026