[do not merge] enable v1 protocol by default

[hannahkm]

DO NOT MERGE -- testing v1 trace protocol

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.85%. Comparing base (8320dee) to head (96e9ca1).

Files with missing lines	Patch %	Lines
ddtrace/tracer/payload_v1.go	47.61%	5 Missing and 6 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
ddtrace/tracer/option.go	83.79% <100.00%> (-0.03%)	⬇️
ddtrace/tracer/payload_v1.go	62.37% <47.61%> (-0.16%)	⬇️

... and 4 files with indirect coverage changes

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-01-12 22:23:51

Comparing candidate commit 96e9ca1 in PR branch hannahkm/etp-testing with baseline commit 8320dee in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 157 metrics, 7 unstable metrics.