chore(ci): update performance runner image

[jdx]

Summary

• pin performance workflows to the verified perf-runner image containing GitHub CLI
• report perf-runner revision fd66d9b in job summaries
• start a fresh TAK_RUNNER series for the rebuilt measurement environment

Image: ghcr.io/jdx/perf-runner@sha256:5263c143b12ce2234e7b0b21d3d6501c2ed05837b42937d0eaeaa191cd5c8e68

Validation

• actionlint
• git diff --check

AI-assisted — Tool: Codex; model: unavailable; version: unavailable.

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Note

Low Risk
Workflow-only pinning of the self-hosted perf container; no application or auth changes, with the main effect being a deliberate break in comparability with measurements recorded under the old image until series baselines use the new label.

Overview
Bumps the pinned ghcr.io/jdx/perf-runner container digest for both perf (main measurements) and perf-pr (PR instruction-count compare) so CI runs on perf-runner@fd66d9b instead of the previous image.

The TAK_RUNNER env label gains an -img5263c143 suffix so tak can treat this image as a distinct runner environment, and the Runner metadata step logs the new revision and digest to match what jobs actually use.

^{Reviewed by Cursor Bugbot for commit ef3b0e9. Bugbot is set up for automated code reviews on this repo. Configure here.}

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📥 Commits

Reviewing files that changed from the base of the PR and between cec178f and ef3b0e9.

📒 Files selected for processing (2)

• .github/workflows/perf-pr.yml
• .github/workflows/perf.yml

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[github-actions]

Instruction counts

benchmark	trend	instructions	Δ	wall (min)	Δ
markdown	██▁	380,430,322 → 380,374,693	-0.01%	63.05 → 63.28ms	+0.36%
startup	▅▁█	944,250 → 950,986	+0.71%	1.17 → 1.15ms	-1.27%

No instruction-count regression above 1%.

_{Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run.}

_{Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes.}

Shadow comparison

Parsing mise use -g node@20 against a shadow of mise's committed spec.
Reported, not gated: the shadow grows as the derive learns to express more, so
what to watch is the ratio rather than either column.

framework	stripped binary, bytes
usage	1344728
bpaf	2493216
clap	3101656

framework	instructions, cold parse	vs usage
usage	8530	—
clap	6315758	740x
bpaf	21909029	2568x

                                              min       p01       p10    median
usage-rs: argv -> struct                     1237      1273      1288      1296  ns
clap: build tree + parse -> struct        1781728   1782748   1788400   1798056  ns
bpaf: build parser + parse -> struct      5621528   5621528   5664860   5748769  ns

usage: argv -> struct                            1225 ns      1.22 µs
clap: build tree + parse -> struct            1821684 ns   1821.68 µs
clap: parse -> struct, tree reused              72380 ns     72.38 µs
clap: build tree only                         1040220 ns   1040.22 µs

_{ef3b0e99afff vs cec178fe25db · measured on the runner, not pushed to the history.}