chore(format): adopt shared prettier config

[mark-brannan]

Gives this repo the same prettier standard as the rest of the family (.prettierrc is byte-identical everywhere: printWidth 100, semi, single quotes, trailing commas).

Two commits, so the config diff stays reviewable:

1. chore(format): .prettierrc, .prettierignore, prettier@3.6.2 pinned as a devDependency, format and format:check scripts, lockfile.
2. style: format with prettier: 11 files, formatting only.

npm run format:check and npm test (31/31) pass.

🤖 Generated with Claude Code

https://claude.ai/code/session_013tZDedCyFeyx2FHWZfMtvC

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[github-actions]

Complexity: +0 across 3 functions

File	Function	Cyclomatic	Δ	Cognitive
web/app.js:159	(anonymous)#5	2 → 1	-1	2 → —
web/app.js:133	control	5 → 6	+1	9 → 9
test/calc.test.mjs:41	(anonymous)#3	1 → 1	+0	0 → —

All metrics

Function	Metric	Before	After
web/app.js · (anonymous)#5	ccn	2	1
web/app.js · (anonymous)#5	cognitive	2	—
web/app.js · (anonymous)#5	halstead.N1	9.0	—
web/app.js · (anonymous)#5	halstead.N2	12.0	—
web/app.js · (anonymous)#5	halstead.bugs	0.01	—
web/app.js · (anonymous)#5	halstead.difficulty	2.73	—
web/app.js · (anonymous)#5	halstead.effort	229.09	—
web/app.js · (anonymous)#5	halstead.length	21.0	—
web/app.js · (anonymous)#5	halstead.n1	5.0	—
web/app.js · (anonymous)#5	halstead.n2	11.0	—
web/app.js · (anonymous)#5	halstead.vocabulary	16.0	—
web/app.js · (anonymous)#5	halstead.volume	84.0	—
web/app.js · (anonymous)#5	length	1	1
web/app.js · (anonymous)#5	mi.mi_original	147.5	—
web/app.js · (anonymous)#5	mi.mi_sei	137.3	—
web/app.js · (anonymous)#5	mi.mi_visual_studio	86.26	—
web/app.js · (anonymous)#5	nesting	0	0
web/app.js · (anonymous)#5	nloc	1	1
web/app.js · (anonymous)#5	params	0	0
web/app.js · (anonymous)#5	tokens	20	1
web/app.js · control	ccn	5	6
web/app.js · control	cognitive	9	9
web/app.js · control	halstead.N1	127.0	129.0
web/app.js · control	halstead.N2	128.0	128.0
web/app.js · control	halstead.bugs	0.36	0.36
web/app.js · control	halstead.difficulty	22.67	22.67
web/app.js · control	halstead.effort	34809.29	35082.3
web/app.js · control	halstead.length	255.0	257.0
web/app.js · control	halstead.n1	17.0	17.0
web/app.js · control	halstead.n2	48.0	48.0
web/app.js · control	halstead.vocabulary	65.0	65.0
web/app.js · control	halstead.volume	1535.7	1547.75
web/app.js · control	length	24	30
web/app.js · control	mi.mi_original	79.29	75.64
web/app.js · control	mi.mi_sei	61.24	53.81
web/app.js · control	mi.mi_visual_studio	46.37	44.23
web/app.js · control	nesting	3	3
web/app.js · control	nloc	22	28
web/app.js · control	params	3	3
web/app.js · control	tokens	234	255
test/calc.test.mjs · (anonymous)#3	ccn	1	1
test/calc.test.mjs · (anonymous)#3	cognitive	0	—
test/calc.test.mjs · (anonymous)#3	halstead.N1	9.0	—
test/calc.test.mjs · (anonymous)#3	halstead.N2	10.0	—
test/calc.test.mjs · (anonymous)#3	halstead.bugs	0.01	—
test/calc.test.mjs · (anonymous)#3	halstead.difficulty	2.78	—
test/calc.test.mjs · (anonymous)#3	halstead.effort	200.94	—
test/calc.test.mjs · (anonymous)#3	halstead.length	19.0	—
test/calc.test.mjs · (anonymous)#3	halstead.n1	5.0	—
test/calc.test.mjs · (anonymous)#3	halstead.n2	9.0	—
test/calc.test.mjs · (anonymous)#3	halstead.vocabulary	14.0	—
test/calc.test.mjs · (anonymous)#3	halstead.volume	72.34	—
test/calc.test.mjs · (anonymous)#3	length	1	1
test/calc.test.mjs · (anonymous)#3	mi.mi_original	148.51	—
test/calc.test.mjs · (anonymous)#3	mi.mi_sei	138.65	—
test/calc.test.mjs · (anonymous)#3	mi.mi_visual_studio	86.85	—
test/calc.test.mjs · (anonymous)#3	nesting	0	0
test/calc.test.mjs · (anonymous)#3	nloc	1	1
test/calc.test.mjs · (anonymous)#3	params	0	0
test/calc.test.mjs · (anonymous)#3	tokens	19	1

Measured 7 changed files, b3cf66a against 7022205. A measurement, not a gate.
Every metric is in the run's complexity artifact: complexity run

[claude]

Claude finished @mark-brannan's task in 40s —— View job

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Review of #28: adopt shared prettier config

No blocking findings. One toil finding, below.

What I ran

• npm ci: clean, 0 vulnerabilities.
• npm test: 31/31 pass.
• git diff origin/main...HEAD -- web/app.js README.md SECURITY.md CONTRIBUTING.md package-lock.json package.json: read in full. I did not read the diffs for bin/, lib/, test/ or web/index.html.

What I could not run

• npm run format:check and npm run build:web were denied by the sandbox's command approval. I did not verify that the tree is prettier-clean, or that the web build still works after the web/index.html reformat (394 added / 173 removed lines).
• npm test includes test/web-bundle.test.mjs, which passes. That is indirect evidence for web/app.js, not for the HTML.
• The public-issue-guard.sh seeding did not land, as the task notes warned. Bash calls were gated per command.

Checked by reading

• Credentials: none in the diff. The lockfile only adds the prettier@3.6.2 integrity hash, which is not a credential.
• Formatting-only claim: the web/app.js diff is wrapping, trailing commas and expanded nested arrays. I saw no logic change. The complexity bot's control ccn 5→6 and its token and length deltas look like measurement noise from the re-wrapped h(...) and addEventListener calls, not new branches.
• Docs: README, SECURITY and CONTRIBUTING changes are table padding and *x*→_x_ only. They add no prose, so .writing-rubric.md has nothing to cite. The rubric's 110-character limit is about rendered cell width, not source padding.
• Decision history in comments or md: none added. .prettierignore has one why-comment for .github, which is fine.
• Repo conventions: the repo has no CLAUDE.md or AGENTS.md.

Findings

• toil: nothing runs format:check in CI, and .github/workflows has only release-please.yml. The standard will drift after merge. Fix: add a npm run format:check step to the existing test workflow, or call the shared one in mark-brannan/.github. I can't edit workflows. Skip it if the fleet intentionally leaves enforcement to a local hook.