Collect garbage before each soak memory sample

[egeominotti]

Problem

Quality (runtime-d) failed on #44 with "Agent memory footprint grew by more than 128 MiB after warmup" (153 MiB), unrelated to that PR. The samples showed a plateau (110 → 193 → 193 MiB), not a leak. The leak budget measured memory without collecting garbage, so the reading depended on GC timing.

Reproduced on Linux (oven/bun:1.4.2 in Docker), with the same run three times: growth 87, 53, 110 MiB.

Fix

scripts/resilienceAgent.ts (test harness only) forces Bun.gc(true) before each metrics sample, so the budget measures retained memory. A real leak is retained memory and is still caught; the noise floor drops.

Linux, four runs after the change: growth 26, 12, 18, 25 MiB. macOS stays at 0. The 128 MiB budget is unchanged.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Resilience metrics now report memory usage after a forced garbage collection, reducing measured growth from 53–153 MiB to 12–26 MiB.
• Documentation
  • Added an unreleased changelog entry describing the updated memory measurements.

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• CHANGELOG.md
• scripts/resilienceAgent.ts

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