Make the existing v12 unit tests runnable from a clean checkout

[simple-analytics-ai]

Base: #40 (v12). Merge this support PR into v12.

Status: Closed as superseded by the parallel #107 cleanup. For this request, the branch was updated afterward with v12@3395422 in merge commit 40c69f3. It remains closed; no new CI run was triggered.

Summary

Fixes #107

Make pnpm run test:unit build the tracker before running Mocha, while retaining v12's --exit option. CI calls that single command.

-test:unit: mocha "test/unit/*.test.js" --exit
+test:unit: node compile.js && mocha "test/unit/*.test.js" --exit

Requested update: resolve PR #113's conflicts and merge the current v12 branch into it. The jsdom dependency and CI unit-test step have since landed through #106; keep those changes and the newer Handlebars dependency. Only two tooling lines differ from v12; tracker source and committed distribution bytes match it exactly.

Security implications

• No security impact
• Has security impact - described as:

Testing

• Before: GitHub reported conflicts with v12; its standalone unit command depended on an existing build.
• After: Node 24.18.0 / pnpm 11.17.0 frozen installation passed; test:unit rebuilt successfully and all 41 tests passed.
• BrowserStack matrix tests: 11 passed. Deployment tests: 12 passed. TypeScript, formatting of the two changed files, and git diff --check passed.
• Current main was refreshed through the broker and is included in the merged v12 history.
• Full BrowserStack runs in CI; local validation used the offline suites.

Merge Danger

Door: two-way. Blast Radius: tooling.

Checklist

• Linked to an issue
• Tested
• Asked for a review

[github-actions]

Claude review checkpoint

Reviewed commit 1fcd13803adcac9d799c0f37732233a8fabd40fa. This is used to keep later automated reviews focused on changes Claude has not checked yet.

[github-actions]

SDLC label: change: routine because Developer tooling only: adds a test:unit npm script, a jsdom devDependency with matching lockfile entries, and a CI step running the existing unit tests; no customer data, authorization, billing, schema, or production runtime behavior is affected

[simple-analytics-ai]

Superseded by current v12: package.json already declares jsdom 26.1.0 and test:unit, the frozen lockfile includes that dependency, and the workflow runs the build plus unit suite even when BrowserStack is skipped. Current v12 passes a clean frozen install and 39 unit tests after building. Merging this older branch would replace the current test command and conflict with already-landed workflow and dependency updates, so it is no longer needed for #107.