LoopX v0.2.0 — engineering baseline and module split

Added

• Python engineering baseline: pyproject.toml with dev tooling config (ruff, coverage, jsonschema) — runtime stays stdlib-only.
• CI upgrade: Python 3.10/3.12/3.13 test matrix, ruff lint step, coverage reporting with an 80% floor (measured baseline 83%).
• Schema standardization: all 17 schemas declare $schema (draft-07); new scripts/validate_schemas.py validates schemas with the standard jsonschema library in CI and keeps them compatible with the built-in lightweight validator.
• Release tag check: new CI release job verifies on tag pushes (vX.Y.Z) that the tag matches both manifest.json and loopx/manifest.json versions; plain pushes and PRs skip it.

Changed

• Module split of large files (behavior unchanged, public APIs re-exported in place):
  • loopx_controller.py no longer star-imports; explicit re-exports only.
  • loopx_controller_core.py (879 → 396 lines) split into CLI assembly (loopx_controller_cli.py) and requirement-intake commands (loopx_controller_intake.py).
  • loopx_health.py (758 → 176 lines) split into base contracts, core checkers, and safe project-command execution.
  • loopx_controller_evidence.py (706 → 290 lines) split into shared constants/file resolution, per-artifact semantic validators, and work-item validation.
• README workflow diagrams (EN/ZH) now include quality audit, health check, and final report, matching the mermaid graph.

Fixed

• tests/test_loopx_policy.py builds snapshots in an isolated temp project instead of the repo root, which started detecting the repo's own pyproject.toml via project-profile auto-detection and drifted expectations.
• CI installs coverage[toml]: bare coverage cannot read pyproject.toml config on Python 3.10 (no stdlib tomllib).