Add perf/* label taxonomy and wire memory-leak-fixer labeling

[mattleibow]

What

Two related improvements to the memory-leak-fixer skill and the triage label system:

1. A perf/* label sub-axis under the tenet/performance umbrella, and wiring the memory-leak-fixer workflow to label its findings correctly (it previously only applied the unused agentic-workflows label).
2. A terminology rework of the memory-leak-fixer: its 11 rotating leak categories are now "focus areas" instead of "families", matching the new performance-fixer skill (Add performance-fixer skill + make the benchmark harness AI-ready #4361).

Part 1 — perf/* label taxonomy

Memory-leak findings (and performance issues generally) had no meaningful label. There's no dedicated "memory-leak" label, and the triage skill had no rule mapping leaks/perf to a tenet. The agentic-workflows label is read by nothing and appears on zero issues/PRs.

The perf/* labels (created in the repo, color 1D76DB), grounded in the repo's real performance issue corpus (61 tenet/performance + ~25 memory-leak issues):

Label	Covers
perf/memory-leak	unbounded memory growth, leaked native handles, undisposed objects
perf/allocations	excessive managed allocations / per-frame GC/heap churn
perf/interop	P/Invoke marshalling / native interop overhead (incl. lock contention)
perf/rendering	slow drawing / rendering / GPU frame performance
perf/throughput	operation slower than expected: encode/decode, file loading, pixel/format conversion, readback
perf/startup	slow initialization / first-use latency
perf/size	binary / package / output size

Rule: any perf/* implies tenet/performance (the tenet is the umbrella, perf/* is the sub-type).

Changes:

• memory-leak-fixer workflow — drop agentic-workflows; label the finding issue + fix PR with tenet/performance + perf/memory-leak. SKILL.md Phase 4 documents it.
• issue-triage skill — add the perf axis to labels.md (table + tips), triage-schema.json (classifiedPerf enum + validated perf[] field), schema-cheatsheet.md, SKILL.md, and the report template.
• auto-triage workflow — apply classification.perf[] labels; bump add-labels cap 10 → 12 for the new axis.

Type classification (type/bug vs type/enhancement) is intentionally left to triage — a leak is usually a bug, but a "make it faster" perf issue may be an enhancement.

Part 2 — "family" → "focus area" rework

Aligns the memory-leak-fixer with the performance-fixer skill's vocabulary (#4361), which uses focus areas and a focus_area knob rather than "families":

• references/types-of-leaks.md — intro, quick-index table header (Family → Focus area), and all cross-references (family N → area N).
• SKILL.md — catalogue framing (11 real families → 11 real focus areas), Phase 1.1 round-robin, and every reference; the single overarching "leak family" is reworded to "class of leaks" to drop the term entirely.
• memory-leak-fixer workflow — renamed the focus_family dispatch input to focus_area and updated the body/comments.

Terminology only — no behavioural change.

Both .lock.yml files recompiled with gh aw compile (0 errors).

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[github-actions]

📦 Try the packages from this PR

Warning

Do not run these scripts without first reviewing the code in this PR.

Step 1 — Download the packages

bash / macOS / Linux:

curl -fsSL https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.sh | bash -s -- 4362

PowerShell / Windows:

iex "& { $(irm https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.ps1) } 4362"

Step 2 — Add the local NuGet source

dotnet nuget add source ~/.skiasharp/hives/pr-4362/packages --name skiasharp-pr-4362

More options

Option	Description
--successful-only / -SuccessfulOnly	Only use successful builds
--force / -Force	Overwrite previously downloaded packages
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--build-id ID / -BuildId ID	Download from a specific build

Or download manually from Azure Pipelines — look for the nuget artifact on the build for this PR.

Remove the source when you're done:

dotnet nuget remove source skiasharp-pr-4362

[github-actions]

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