[schloerke]

Fills the memory bank from the stack's previous PR with one document per subsystem. Each was written from the current code and points to files and function names, not line numbers.

• requestFlow.md: how app HTTP and WebSocket traffic reaches the engine with no server. Covers service worker registration, /app_<id>/ routing, fetchASGI, the injected socket shim, COOP/COEP/CORP headers, and caching.
• pythonEngine.md: how Pyodide starts, the worker and main-thread proxies, ResultType, the Python helpers that start and stop apps, how output reaches the terminal, and load status.
• rEngine.md: how webR starts, the mounted shiny library image, .start_app and .shiny_tick, the httpuv request path, and how R differs from Python.
• buildPipeline.md: what make all, scripts/build.ts, _shinylive, and make dist do, and how build/, site/, and _shinylive/ relate.
• pythonPackageVersions.md (expanded): scripts/pyodide_packages.py, the three lock files, how wheel versions are set, libsass, and update_shiny.yml.
• appModes.md: app modes, runApp() options, URL hash handling, share links, the examples index, and how each site_template/ page starts.
• editorLanguageServer.md: the CodeMirror setup, per-file editor state, the in-browser Pyright worker and typeshed.en.json, and what R gets instead.
• quartoAndExport.md: the files and formats the external shinylive packages and Quarto rely on, which must stay stable.
• ciAndRelease.md: what each workflow runs, what gates the shinylive.io and GitHub Pages deploys, and how a release is cut.

Findings recorded in the docs that may be worth their own issues:

• The quarto/ folder is gone, but README.md and make quarto / make quartoserve still refer to it.
• runExportedApp accepts relPath and never uses it.
• The "unused arguments" warning in runApp() can never fire, because propertyOfAppOptions returns its input.
• The "already in Pyodide" check in update_pyodide_pyodide_lock_json looks at the top-level keys of the lock file, not at package names.

[github-actions]

Unit tests only — the pure-logic modules in src/. The React components, hooks, engine proxies and service worker are covered by the pytest + Playwright suites in tests/, which are not measured here.

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	100%	1994/1994
🟢	Branches	100%	400/400
🟢	Functions	100%	96/96
🟢	Lines	100%	1994/1994

Test suite run success

342 tests passing in 20 suites.

Report generated by 🧪jest coverage report action from e88d514