Summary

Closes #1744.

This ports APM's explicit universal instruction intent to Cursor's native always-on rule shape. When a source instruction declares applyTo: "**", Cursor output now emits alwaysApply: true and omits globs:. Scoped patterns still emit globs: as before, including comma-separated lists and YAML sequence inputs.

This follows the maintainer clarification on #1744: do not add a new APM source alwaysApply field; instead faithfully translate the existing universal applyTo: "**" intent into Cursor's documented native form.

What changed

• Parse Cursor instruction frontmatter through the existing bounded YAML loader.
• Convert exactly-one universal glob (**, including padded string or one-item YAML sequence) to alwaysApply: true.
• Preserve existing scoped glob behavior for scalar globs, comma lists, and YAML lists.
• Guard null/non-mapping frontmatter values so empty applyTo: does not become a literal "None" glob.
• Document the Cursor transform and add a changelog entry.

Validation

• uv run --extra dev pytest tests/unit/integration/test_instruction_integrator.py::TestConvertToCursorRules tests/unit/integration/test_instruction_integrator.py::TestCursorRulesIntegration tests/unit/integration/test_instruction_integrator.py::TestApplyToCommaSplitting tests/integration/test_apply_to_comma_e2e.py -q (52 passed)
• uv run --extra dev pytest tests/unit/integration/test_instruction_integrator.py -q (117 passed)
• uv run --extra dev ruff check src\apm_cli\integration\instruction_integrator.py tests\unit\integration\test_instruction_integrator.py
• uv run --extra dev ruff format --check src\apm_cli\integration\instruction_integrator.py tests\unit\integration\test_instruction_integrator.py
• npm run build --prefix docs
• git diff --check

Pre-push duplicate check: #1744 is still open, unassigned, and no open PR matched #1744 / alwaysApply / Cursor frontmatter / applyTo terms.