chore(extension): ignore the bundled stealth.js build output

[vringar]

Extension/bundled/content.js and bundled/feature.js are already ignored as webpack output. bundled/stealth.js is not, because master's webpack config does not emit it — only the stealth instrument branch (#1154) does.

That asymmetry is a trap, and it just cost a CI run.

How it fails

1. A local extension build on the stealth branch writes Extension/bundled/stealth.js. npm run clean is rm -rf build test, so it does not remove anything under bundled/.
2. The file is gitignored on the stealth branch, so nothing complains there.
3. Any commit subsequently made from a master-based branch snapshots it, because master has no such ignore rule.
4. CI then fails somewhere that points nowhere near the cause.

Why the failure is so misleading

The failing step is Run ./.github/actions/setup, not ./scripts/ci.sh — the test suite never starts, so there is no pytest output at all, just a downstream No files were found with the provided path: coverage.xml.

Inside setup, scripts/build-extension.sh runs npm ci, which triggers npm's prepare lifecycle → npm run build && npm run test → test:lint → eslint .. Extension/eslint.config.mjs ignores generated bundles by explicit allowlist:

ignores: [
  "bundled/feature.js",
  "bundled/content.js",
  "bundled/privileged/sockets/bufferpack.js",
  ...
]

bundled/stealth.js is absent from that list on master (the stealth branch adds it), so the 211 KB webpacked bundle is linted as ordinary source:

✖ 1633 problems (1622 errors, 11 warnings)

Every shard of tests, plus demo and pre-commit, fails identically, because they all run the same composite setup. Nothing in the failure output mentions the stray file's origin.

Fix

Ignore the file on master too, so it cannot be committed from either branch. One line.

This overlaps the entry #1154 already adds to the same file; whichever lands second drops the duplicate.

[Copilot]

🟢 Approval recommended

The change is a minimal, correct gitignore update that aligns bundled-output handling and introduces no functional or behavioral risk.

Pull request overview

This PR prevents accidental commits of a generated WebExtension bundle (bundled/stealth.js) that is emitted on the stealth instrumentation branch but not on master, which can otherwise cause ESLint to lint large build output during CI setup and fail before tests run.

Changes:

• Add Extension/bundled/stealth.js to Extension/.gitignore alongside other webpack bundle outputs.

File summaries

File	Description
Extension/.gitignore	Ignores the bundled/stealth.js build artifact to avoid CI linting failures caused by stray generated output.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.34%. Comparing base (975b09c) to head (dfea429).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1232      +/-   ##
==========================================
+ Coverage   62.31%   62.34%   +0.02%     
==========================================
  Files          40       40              
  Lines        3930     3930              
==========================================
+ Hits         2449     2450       +1     
+ Misses       1481     1480       -1     

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