perf(logging): add guarded exec_mx lock-elision research - #139
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Add explicit formatter and backend capability hooks with a serialized fallback so Logger can elide exec_mx only for implementations that document complete concurrent lifecycle safety. Cover the opt-in and fallback paths with deterministic tests and a 1/4/16/32 producer research benchmark, and document the contract in ADR 0006.
Replace make_unique in the capability regression test with explicit unique_ptr construction so the Linux C++11 matrix compiles with GCC.
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Require opted-in backends to make clear_logs safe alongside dispatch and lifecycle operations, matching the Logger paths that can run concurrently without exec_mx.
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Summary\n- add explicit formatter/backend concurrency capability hooks (default false)\n- elide per-strategy exec_mx only when both capabilities opt in; retain serialized fallback\n- add fallback/opt-in regression tests and a 1/4/16/32 producer A/B benchmark\n- document the lifecycle contract in ADR 0006 and benchmark guidance\n\nThe benchmark is intentionally machine-specific research. Built-in backends remain serialized until their complete lifecycle contracts are audited.