line:memory-trim-diagnostics: restore fail-open runtime diagnostics

[Skywind5487]

Work line: \line:memory-trim-diagnostics\

Part of merge unit
epair:memory-runtime\ (#110).

Depends on: PR #131 (\line:memory-trim-policy).

Commits

1. \eat(mem-trim): restore fail-open runtime diagnostics\ — GC/trim timing split + fragmentation + VmSwap

Behavior

• Separate \gc_ms\ and \ rim_ms\ timing attribution
• Best-effort \malloc_info(3)\ fragmentation stats (process totals, no double-count)
• \VmSwap\ evidence from /proc/self/status\
• Diagnostic failures degrade gracefully, never block recovery

Coverage

6 diagnostics tests in \ ests/hermes_cli/test_mem_trim_diagnostics.py.

Composed into integration PR #120 (
epair:memory-runtime).

[github-actions]

૮ >ﻌ< ა ci review

_{ran on 64445e2 — feat(mem-trim): restore fail-open runtime diagnostics}

❌ Job failures

Python tests / Run tests slice 2/12 · View job

Job Python tests / Run tests slice 2/12 failed.

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⚠️ Warnings

CI timings · View report · View job

Wall time 5m23s vs 3m25s (+57.6%). 12 job(s) slower, 9 faster, 3 unchanged.

• OSV scan / Scan lockfiles / osv-scan: +26.0s
• OS-specific tests / macOS-only tests: +21.0s
• Python tests / Run tests slice 9/12: -15.0s
• Python tests / Run tests slice 11/12: +12.0s
• Python tests / Run tests slice 7/12: -10.0s

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OSV vulnerability scan · View job

5 known vulnerabilities found in pinned dependencies.

• CVE-2026-67213 in package-lock.json
• CVE-2026-67213 in website/package-lock.json
• CVE-2026-70608 in package-lock.json
• CVE-2026-56876 in package-lock.json
• CVE-2026-70606 in package-lock.json

How to fix:

Review the findings in the Security tab. Update the affected dependencies if a patched version is available.