emrg: restart-to-apply — install runtime python + PYTHONPATH in packaged mode; emrg stop --skip-gui (rant 2026-08-21T12:44:34)

[argszero]

Restart-to-apply: use the install runtime python + PYTHONPATH in packaged mode

Follow-up to #915 (rant 2026-08-21T12:44:34, GUI "Restart to apply" button).

Bug found during review

The restart flow spawned python -m emrg._stop_all --skip-gui using
_findPython(), which in packaged mode resolves to the host's PATH
python3 — that interpreter has no emrg package importable (the packaged
app's emrg lives in ~/.emrg/install/{source,lib}), so the full-chain stop
would fail with No module named emrg and the relaunch would never happen.

Fix

• emrg/gui/daemon_client.js: _findInstalledPython() resolves the
  install runtime python exactly like the bin/emrgd launcher
  (bin/python on POSIX; bin/python-dist/python*.exe on Windows, with the
  R100 DLL caveat); _installedPythonPath() returns the launcher-equivalent
  PYTHONPATH="$PREFIX/source:$PREFIX/lib".
• emrg/gui/main.js emrg:restartDaemon: in packaged mode spawn the
  install python with PYTHONPATH injected; source mode keeps the repo
  venv python. windowsHide added for the Windows black-window case.
• emrg/__main__.py: emrg stop gains --skip-gui → _stop_all(skip_gui=...),
  so the GUI could also drive the CLI directly (same semantics as
  python -m emrg._stop_all --skip-gui).

Tests / verification

• tests/test_main.py: +1 — emrg stop --skip-gui parses skip_gui=True.
• tests/test_installer_stop.py: delegation test updated for the new
  sys.exit(_stop_all(skip_gui=...)) dispatch + --skip-gui flag.
• renderer.smoke.test.js: restart test extended — asserts
  _findInstalledPython() / _installedPythonPath() are used and present
  in both main.js and daemon_client.js.
• Local: Python pytest 994 passed + 1 skipped (995 collected, Agent.md
  synced), GUI npm test 257 (249 pass + 8 skipped), node --check on
  main.js + daemon_client.js OK, emrg stop --help shows --skip-gui,
  import + CLI OK.

[argszero]

✅ LGTM — cycle

Fresh review of the packaged-mode restart fix (rant 2026-08-21T12:44:34 follow-up):

• Root cause confirmed: _findPython() in packaged mode falls through to PATH python3, which has no emrg importable — python3 -m emrg._stop_all would fail and the relaunch never happen.
• daemon_client.js: _findInstalledPython() mirrors the bin/emrgd launcher's python resolution (POSIX bin/python; Windows python-dist\python*.exe with R100 DLL caveat); _installedPythonPath() = install/source:install/lib, matching the launcher's PYTHONPATH.
• main.js: packaged mode spawns install python with PYTHONPATH injected + windowsHide; source mode unchanged (repo venv).
• emrg/__main__.py: emrg stop --skip-gui → _stop_all(skip_gui=...) — CLI parity with the module path.
• Tests: +1 CLI parse test, installer delegation test updated, GUI source-level test extended (asserts both helpers present + used). Full local suite green: pytest 994 passed + 1 skipped (995 collected, Agent.md synced), GUI 257 (249+8), node --check OK, emrg stop --help shows --skip-gui, import + CLI OK.

1/3.

[argszero]

✅ LGTM — cycle

2nd review (head e0350da, CI test + test-windows PASS on run 32453323985):

• Fresh local verification on this branch: Python pytest 994 passed + 1 skipped (995 collected, matches Agent.md), GUI npm test 257 (249 pass + 8 skipped), node --check on main.js + daemon_client.js OK, import + CLI OK, emrg stop --help exposes --skip-gui.
• _findInstalledPython() mirrors the bin/emrgd launcher resolution (POSIX bin/python; Windows python-dist\python*.exe with R100 DLL caveat + python.exe fallback); _installedPythonPath() = install/source:install/lib matching the launcher's PYTHONPATH.
• main.js: packaged mode spawns install python with PYTHONPATH injected + windowsHide on win32; source mode unchanged (repo venv). emrg/__main__.py wires emrg stop --skip-gui → _stop_all(skip_gui=...).
• Tests cover the new paths (CLI parse + installer delegation + GUI source-level). No issues found.

2/3.

[argszero]

✅ LGTM — cycle

3rd consecutive review (head e0350da, MERGEABLE/CLEAN, CI test + test-windows PASS):

• Fresh local verification on this branch: pytest 994 passed + 1 skipped (995 collected, matches Agent.md), emrg stop --help shows --skip-gui, import + CLI OK, GUI npm test 257 (249 pass / 0 fail / 8 skipped).
• _findInstalledPython() mirrors the bin/emrgd launcher resolution (bin/python on POSIX; python-dist/python*.exe on Windows with the R100 DLL caveat); _installedPythonPath() returns the launcher-equivalent PYTHONPATH (source:lib). restartDaemon uses the install python + PYTHONPATH in packaged mode, repo venv in source mode; windowsHide added.
• emrg stop --skip-gui → _stop_all(skip_gui=...) keeps the GUI alive to relaunch itself — correct restart-to-apply semantics (rant 12:44:34 follow-up).
• Tests cover the new flag parsing, the installer-stop delegation, and the packaged-python presence in main.js/daemon_client.js.

3/3.