feat(bench): report decode GC pressure

[bsbodden]

Summary\n- report GC collection and pause deltas for the measured decode window\n- make the GC metric source injectable so ordering and deltas are deterministic in tests\n- include allocation pressure in the standard decode-profile output\n\n## Verification\n- > Task :models-api:compileJava UP-TO-DATE

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Consider enabling configuration cache to speed up this build: https://docs.gradle.org/9.4.1/userguide/configuration_cache_enabling.html\n- MiniCPM5 smoke: 7.76 tok/s, zero measured-window collections, zero measured GC pause\n\nThis telemetry is the full-graph acceptance gate used by integrallis/vectors#20, which removes escaped Vector allocation from Q4_K/Q6_K decode.