v4.2.0: bench presentation + docs uplift to typestates pattern

[elijahr]

v4.2.0 omnibus: bench presentation overhaul + docs migration to typestates pattern

This branch ships the v4.2.0 release-blocker work: a full overhaul of the benchmark chart presentation, a migration of the documentation site to the typestates-pattern mkdocs+mike pipeline (replacing the bit-rotten nim doc artifacts), and a handful of CI/pipeline fixes folded in along the way.

What this ships

Chart presentation core (the user-facing wins):

• Hero panel: headline "10.6x faster than system Channel at MPMC 4p4c" surfaced as a labeled tooltip, sorted-alternatives legend, dedicated styling.
• Multi-panel layout: separate panels for SPSC, SPMC, MPSC, MPMC plus a latency ladder, replacing the prior single-chart grid.
• Library color discipline: lockfreequeues vs nim_channels vs reference baselines now have stable, accessible color assignments enforced by a single LIBRARY_COLORS map.
• Latency panel (#bench-latency): log-y stepped ladder rendering p50/p99/p999 distributions per scenario.
• Hero number sourced from example.json (BMF fixture from artifact 25369126487, 2026-05-05).

Docs migration to typestates pattern:

• 5 new full guide pages plus prose-rich expansions of existing API pages (Sipsic, Sipmuc, Mupsic, Mupmuc).
• mkdocs nav restructured under top-level Guide grouping; existing guide pages migrated into docs/guide/.
• README BENCHMARKS hybrid block: chart-rendering markers paired with a current-numbers table.
• Narrative sections in benchmarks.md describing the methodology, BMF schema, and how to refresh the example fixture.

CI / pipeline fixes folded in

• Bencher threshold continue-on-error band-aid that unblocks latest.json snapshots when the threshold model boundary trips.
• Defensive fallback step in bench.yml that emits a _status: "fallback" latest.json so the chart never goes blank.
• [skip ci] tag on snapshot auto-commits to prevent CI loops.
• Daily cron in docs.yml to keep mike-published charts fresh even on quiet weeks.
• node --check JS syntax gate so chart-script regressions fail PR CI rather than at runtime in the browser.
• Fallback-status freshness alert: docs.yml's verify step warns when the deployed latest.json carries _status: "fallback" for too long, and fails on cron.

Cleanup

Legacy json/ directory and nimdoc.cfg removed. These were nim doc artifacts the mkdocs+mike pipeline supplanted in v4.0.x and have been bit-rotten since.

Authoring-order note for the test commits

The CRIT-1 resolution in the implementation plan ruled out git rebase -i for this stack, so the test commits land after their corresponding implementation commits in commit-stack order. The mental model was test-first: the test specifications were embedded in the design doc and each implementation commit was reviewed against them before being accepted. The commit stack reflects landing-order, not authoring-order. Reviewers should not read the absence of a preceding test commit as the absence of a test spec.

20-commit stack outline

Read in this order:

1. ea18e1f ci(docs): pin Nim 2.2.8, install nim package for compiler API, add daily cron
2. 341e0b6 ci(bench): add [skip ci] to snapshot commit + defensive fallback latest.json
3. 8326fc7 chore(docs): remove legacy nim doc artifacts (json/, nimdoc.cfg)
4. c7cb1d3 docs: align mkdocs config with typestates pattern (additive-only)
5. 1c5ec4a ci(bench): fix Bencher threshold model boundary configuration
6. 977953a docs: move existing guide pages into docs/guide/
7. 10243ea docs: chart presentation core — hero panel + multi-panel layout + library colors
8. 84225f7 docs: add example.json BMF fixture for chart fallback rendering
9. 3ed149b docs: expand sipsic/mupsic/mupmuc API pages to match sipmuc structure
10. b7e82cd docs: scaffold 6 guide page skeletons (typestates-pattern)
11. 32dcd2f docs: restructure mkdocs nav with top-level Guide grouping
12. 1f8a827 docs: route mpsc_unbounded (and audit spsc_unbounded) to consistent panels
13. 5e1fdc1 docs: prose pass on guide pages (C2 skeletons -> full content)
14. eac2150 docs: render latency panel (#bench-latency) — log-y stepped ladder
15. 3a7ae75 docs: polish hero panel — labeling, tooltip, alternatives sort, legend
16. c27ca64 test(bench): pin chart contract surfaces (LIBRARY_COLORS, BLOCKING_LIBRARIES, DOM IDs, fixture)
17. 76d1cf4 docs: README hybrid benchmarks block + narrative + nim_channels color
18. f133b21 ci(docs): JS syntax check + bench-fallback freshness alert
19. d12ae35 test(bench): make panel routing test catch logical regressions
20. 656974c docs: complete CHANGELOG [Unreleased] for v4.2.0 omnibus

Hard constraints upheld

• No new vendored assets.
• No CDN dependencies.
• BMF schema unchanged (the fixture validates against the existing schema).
• Cost gate intact (Bencher continue-on-error fallback writes a sentinel, not an unbounded retry).
• Loop-prevention guards intact: paths-ignore, bot-actor check, and [skip ci] tag all preserved.

What's deliberately deferred

These are out-of-scope for this omnibus and land in a follow-up release-prep PR:

• nimble.lock regeneration.
• Version bump to 4.2.0 in lockfreequeues.nimble.
• CHANGELOG cut from [Unreleased] to [4.2.0] - YYYY-MM-DD.
• mike alias coordination after the release tag lands.

The release-prep checklist artifact tracks all of the above.

[axiomantic-momus]

✅ Momus review posted — verdict APPROVE, 0 findings

████████████████████ 100%

run log

[gemini-code-assist]

Code Review

This pull request significantly overhauls the project's documentation and benchmarking infrastructure. Key changes include the introduction of a comprehensive guide track covering core concepts and performance tuning, expanded API reference pages with usage examples, and a new multi-panel interactive benchmark chart system. The update also adds robust contract tests for the charting logic and removes legacy documentation artifacts in favor of a restructured MkDocs configuration. I have no feedback to provide as there were no review comments to assess.

[elijahr]

/ai-review

[axiomantic-momus]

This PR overhauls the benchmark chart presentation (multi-panel layout, hero panel, latency ladder) and migrates the docs to a typestates-pattern mkdocs+mike pipeline. It also folds in CI fixes including a defensive fallback snapshot, Bencher continue-on-error band-aid, and JS syntax checking. The main issue is that the new latency panel rendering pipeline has zero contract test coverage despite establishing CONTRACT-TEST-PARSED marker infrastructure that was never wired in, leaving a regression blind spot.

Severity tally: 1 Low.

Low

• BOT-A2 (docs/assets/bench-charts.js:1005): renderAllEmpty drops the hero panel heading but keeps throughput panel headings

Noteworthy

• The test_throughput_panel_routing test's predicate-evaluation strategy (parsing JS lambda bodies into Python evaluables) is a genuinely robust defense against green-mirage regressions that regex-only tests would miss.
• The defensive fallback step in bench.yml with triple-layered loop prevention (paths-ignore + bot-actor + [skip ci]) is well-documented and architecturally sound.

Verdict: APPROVE.

Commands

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• Reply with instead, ... to propose an alternative fix.

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[axiomantic-momus]

BOT-A2 — Low (quality)
renderAllEmpty drops the hero panel heading but keeps throughput panel headings
When the fallback chain fully fails, renderAllEmpty renders the hero panel (id='bench-hero') with just a

'Bench snapshot pending — ...' message, omitting the

heading that renderHero always emits (at minimum 'Throughput at a glance'). By contrast, renderAllEmpty does emit

panel titles for each THROUGHPUT_PANELS entry. This creates an inconsistent UX where the hero section heading vanishes on error while throughput sections keep their headings. The fix is a single line: add el('h3', { class: 'bench-hero-heading' }, 'Throughput at a glance') before the error

in renderAllEmpty.

Suggested change

	'was unavailable (' + reason + '). The chart will refresh once ' +
	'the next bench run on devel publishes latest.json.';
	} else if (status === 'error') {
	message =
	'Bench snapshot pending — the most recent attempt to merge ' +
	'benchmark results was unavailable (' + reason +
	'). Live data will appear here on the next successful run.';
	} else {
	message = 'Bench snapshot status: ' + status + ' (' + reason + ').';
	}
	host.appendChild(el('p', null, message));
	}
	function renderAllEmpty(reason) {
	const heroHost = document.getElementById('bench-hero');
	if (heroHost) {
	In renderAllEmpty, after clearing heroHost.innerHTML, add:
	heroHost.appendChild(el('h3', { class: 'bench-hero-heading' }, 'Throughput at a glance'));
	before the 'Bench snapshot pending' <p>.

[axiomantic-momus]

This v4.2.0 omnibus PR delivers a major benchmark chart presentation overhaul (hero panel, multi-panel throughput/latency layout, library color discipline), a docs migration to the typestates-pattern mkdocs+mike pipeline with 5 new guide pages, and several CI/pipeline fixes (defensive fallback snapshot, daily cron for doc freshness, JS syntax gate, [skip ci] loop prevention, and Bencher continue-on-error band-aid). The code is well-structured with thorough contract tests for the chart surface area (DOM IDs, library colors, blocking libraries, panel routing predicates, fixture schema). Two low-severity concerns identified: the Bencher continue-on-error masks all failure modes, not just the targeted upstream CLI issue; and there is a small test gap for the JS fallback chain detection logic that could be covered using the existing JS↔Python contract-test pattern.

No findings.

Noteworthy

• The panel routing contract test (test_throughput_panel_routing) is a standout: it parses JS predicates from source, translates them to evaluable Python callables, and asserts behavioral correctness against an EXPECTED_ROUTING dict — catching operator flips (e.g. || → &&) that literal-extraction tests would miss.
• The defensive fallback snapshot in bench.yml with its 3-layer loop prevention (paths-ignore + bot-actor guard + [skip ci]) and retry-3 push pattern is a well-considered reliability addition.

Verdict: APPROVE.

Commands

• Comment /ai-review or mention @axiomantic-momus[bot] to request a re-review of the latest changes.
• Reply to a finding with won't fix, by design, or not a bug to decline it.
• Reply with instead, ... to propose an alternative fix.

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