[lbx154]

Moves the PR gate out of Argus into a separate public repository, lbx154/argus-hosting, mounted here as a git submodule at hosting/ (Python package argus_hosting). Argus never imports it at run time.

Draft until the owner has reviewed and created lbx154/argus-hosting. That repository does not exist yet, so the submodule commit (481d78d) cannot be fetched, and the pr-gate check on this PR will fail at checkout until it does.

What moved (to argus-hosting)

• argus/release_tools/pr_gate/ (35 files, ~5.0k lines): the description gate run by CI, the local regression gate (pr-gate check / verify), and the 50-PR study driver.
• Its tests: tests/tools/test_pr_gate*.py, test_local_pr_gate.py, test_pr_regression_study.py (6 files, ~2.7k lines).
• experiments/pr_regression_50/ and docs/local-pr-regression-gate.md.

What stays in argus/release_tools

build_release, generate_manifest, check_artifacts, generate_event_fixtures / generate_event_types, generate_resource_status (what Argus needs to build its own release), plus typecheck_gate, build_plugins, verify_plugin_install, preinstall_plugins / preinstall_verticals, provision_platon, repository_parity, which Argus CI, doctor/repair, the desktop build and plugin authors call.

Wiring

• .github/workflows/pr-gate.yml: checks out with submodules: true and runs PYTHONPATH=hosting python -m argus_hosting.pr_gate --event ... --output .... The submodule is public, so no token is needed.
• scripts/pr-gate: puts hosting/ on the path and runs the same pr-gate command; if hosting/ is empty it says to run git submodule update --init hosting.
• pyproject.toml: removes the pr-gate console script; ruff, mypy and pytest skip hosting/.
• New tests/tools/test_pr_gate_wiring.py: always checks .gitmodules, the workflow, that argus/ never imports argus_hosting, and the launcher's message when the submodule is missing; runs the description gate and the launcher only when the submodule is checked out (otherwise skipped).
• docs/LAYOUT.md and the 2026-09-16 study README point at hosting/.
• Release manifest and frontend artifacts rebuilt (python -m argus.release_tools.build_release).

Tests

• Full Python suite, submodule absent: passed (2 wiring tests skipped).
• Full Python suite, submodule present (local clone): passed.
• ruff check argus argus_skill tests: clean. tests/release_tools: passed.
• argus-hosting's own tests (196) pass with this branch on PYTHONPATH.

After argus-hosting is published

No change is needed here: .gitmodules already records https://github.com/lbx154/argus-hosting.git. Re-run the pr-gate check, then mark ready for review.

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