Aggregate existing JavaScript coverage reports into one PR comment

[markmur]

Replace the separate Web, React Native JavaScript, and Embedded Checkout Protocol (TS) comments with one compact Coverage Report table. Show status emojis, coverage percentages, and full-report links using the existing JavaScript test coverage.

Platform jobs save structured results in GitHub checks. A single publisher reloads current results and serializes comment updates, matching the commit, workflow, and rerun attempt. Pending, skipped, failed, and unavailable results remain visible.

The publisher runs trusted default-branch code and validates numeric results. Automatic aggregate comments begin once its workflow reaches main. Native coverage collection and reporting are added separately in #924.

Continues #926, which GitHub marked merged into its previous stack base during reordering. The aggregation change has not landed on main.

Stack

• Cover native protocol model serialization contracts #936
• Cover protocol runtime mapping and JSON contracts #935
• Report protocol runtime and generated coverage separately #934
• Enforce 85% line coverage for each Swift SDK target #929
• Raise Accelerated Checkouts coverage above 85% #928
• Enforce 85% Android SDK line coverage #927
• Report Swift and Android test coverage #924
• Aggregate existing JavaScript coverage reports into one PR comment #948
• Enforce 85% test coverage thresholds #923

[github-actions]

Bundle Size Budgets

Budget	Size	Limits	Result
—	—	—	➖ No configured budgets affected

Bundle and package size

Web bundle sizes cover shipped runtime JavaScript. Package sizes cover the full published archive, including any source maps, declarations, and documentation it contains.

Platform	Measurement	Compression	Base	Head	Delta
-	-	-	-	-	-

How sizes are measured

Measured from the PR base SHA and PR head SHA. Web bundle rows sum shipped .js, .mjs, and .cjs files under dist/, excluding source maps and declarations. The gzip bundle size sums files compressed individually with gzip -n -9. npm package sizes are gzip-compressed .tgz archives; Android AAR sizes are ZIP archives. Package sizes are not final app binary sizes.

[bitrise]

Bitrise builds

E2E · iOS CI

Checkout Kit E2E results

No native E2E runs were selected for this change.

[markmur]

Coverage Report

Preview rendered from this PR’s current GitHub Actions coverage results.

Status	Platform / target	Lines	Branches	Functions	Report
✅	Web	98.02%	86.64%	97.2%	Full report
✅	React Native	91.49%	87.3%	100%	Full report
✅	Embedded Checkout Protocol (TS)	94.05%	89.17%	90.91%	Full report

[kiftio]

I think we could skip the comment for changes that don't touch JS via something like

const existing = comments.find(isComment);

// Don't open a comment until we know at least one JS platform is in scope.
// Existing comments still update so stale numbers get replaced.
const plan = latest(jobs.filter((item) => item.name === "Detect Changed Areas"));
const inScope = Object.values(results).some((result) => result.state !== "skipped");
if (!existing && (plan?.status !== "completed" || !inScope)) return;