ci(codeql): advanced setup — scope Swift autobuild to macos/** + weekly

[100yenadmin]

What & why

Analyze (swift) runs on every PR (including pure-Python/QA ones) because CodeQL is on GitHub default setup, which autobuilds the macOS Swift app per-language with no path filter — the slow/expensive job. This replaces default setup with committed advanced workflows that keep full language coverage but scope the Swift autobuild to when it actually matters.

• codeql.yml — python + javascript-typescript + actions on ubuntu-latest, build-mode: none (build-free), every PR/push to main + weekly. Same coverage, cheap.
• codeql-swift.yml — swift on macos-latest, build-mode: autobuild, scoped to paths: macos/** (+ the workflow file) and a weekly schedule — so the app still gets periodic scanning, but a Python/QA PR no longer pays the Swift-autobuild tax.

⚠️ Required one-time toggle (owner)

Default CodeQL setup and advanced setup cannot both run — codeql-action/init fails by design while default is enabled. After merging, flip:

Settings → Code security and analysis → Code scanning → "CodeQL analysis" → switch from "Default" to "Advanced"

Until that toggle is flipped, these workflows will show red (init refuses). Recommend flipping it right at merge.

Coverage parity

Default setup analyzed: actions, javascript-typescript, python, swift. This keeps all four — only the trigger for swift changes (scoped vs every-PR). No security coverage is dropped.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 3d84b77 and 1cbc567.

📒 Files selected for processing (2)

• .github/workflows/codeql-swift.yml
• .github/workflows/codeql.yml

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