Add Cursor IDE support (.cursorrules and .cursor/rules/)

[Melissari1997]

Closes #3014

Summary

• Added .cursorrules at the repo root with project-wide context for Cursor's agent system
• Added .cursor/rules/ directory with 22 .mdc rule files mirroring the existing Claude/Codex/Kilo commands
• No changes to source code, tests, documentation build, or CI pipelines

Rule coverage

All existing commands from .claude/commands/, .codex/commands/, and .kilo/command/ are mirrored:

Rule	Purpose
backend-parity	Cross-backend consistency audit
bench	ASV benchmark comparison
dask-notebook	Dask ETL notebook creation
deep-sweep	Multi-sweep dispatch for a single module
efficiency-audit	Performance anti-pattern detection
new-issues	Feature gap analysis and issue creation
ready-to-merge	PR readiness scan
release-major	Major release workflow
release-minor	Minor release workflow
release-patch	Patch release workflow
review-contributor-pr	Security prescreen for outside contributor PRs
review-pr	Domain-aware PR review
rockout	End-to-end issue-to-implementation workflow
sweep-accuracy	Numerical accuracy audit
sweep-api-consistency	API consistency audit
sweep-metadata	Metadata propagation audit
sweep-performance	Performance bottleneck audit
sweep-security	Security vulnerability audit
sweep-style	PEP8 and style audit
sweep-test-coverage	Test coverage gap audit
user-guide-notebook	User guide notebook creation
validate	Numerical accuracy and backend parity check

Test plan

• No source code changes -- purely additive
• .cursor/ excluded from distributions (not in MANIFEST.in or pyproject.toml)
• No CI pipeline changes
• Rule files have valid YAML frontmatter

[Melissari1997]

PR Review: Add Cursor IDE support (.cursorrules and .cursor/rules/)

Suggestions (should fix, not blocking)

• .cursorrules:5 references .kilo/worktrees/ paths. This is Kilo-specific internal structure. Cursor agents won't have access to Kilo worktrees. Either remove this reference or generalize it to describe the worktree pattern without naming Kilo's directory structure.
• rockout.mdc and deep-sweep.mdc reference .kilo/worktrees/ for git worktree isolation. Cursor doesn't use Kilo's worktree convention. The worktree isolation contract should be adapted for Cursor's context (e.g., suggest using git worktree add with a Cursor-appropriate path like .cursor/worktrees/).
• release-major.mdc, release-minor.mdc, release-patch.mdc are nearly identical (85 lines each, differing only in the version increment step). Consider whether Cursor's rule system supports a shared base rule or parameterized rules. If not, the duplication is acceptable but worth noting for future maintenance.
• Several sweep rules (sweep-accuracy.mdc, sweep-metadata.mdc, etc.) reference updating state CSV files at .kilo/worktrees/sweep-*-state.csv. This path is Kilo-specific. Either adapt to a Cursor-appropriate path or note that state tracking is tool-specific.
• The globs field in some rules is set to "*.py" for rules that don't actually operate on Python files (e.g., ready-to-merge.mdc operates on PR metadata, new-issues.mdc operates on README.md and GitHub issues). Consider using more accurate globs or leaving globs empty for non-file-specific rules.

Nits (optional improvements)

• bench.mdc:1 globs is "*.py" but the rule operates on ASV benchmarks in benchmarks/. Consider globs: "benchmarks/**/*.py".
• release-major.mdc:1, release-minor.mdc:1, release-patch.mdc:1 all have globs: "" (empty string). Consider omitting the field or using globs: [] if the format supports it.
• The validate.mdc rule references [TOOL: humanize] which is a Kilo-specific tool reference. Cursor doesn't have this tool. Either remove these references or replace with Cursor-equivalent guidance.

What looks good

• All 22 commands from .claude/commands/, .codex/commands/, and .kilo/command/ are represented
• YAML frontmatter is consistent and well-structured across all files
• The .cursorrules file provides good project-wide context (architecture, conventions, backend dispatch pattern)
• Purely additive change -- no existing files modified
• Rule content is concise and actionable, adapted well from the longer source commands

Checklist

• All source commands have corresponding Cursor rules
• YAML frontmatter present on all .mdc files
• No source code changes
• No CI pipeline changes
• Kilo-specific paths generalized for Cursor
• Tool-specific references (humanize, worktrees) adapted

[Melissari1997]

Follow-up Review: Address review feedback (#3014)

Applied the following fixes from the initial review:

• rockout.mdc: Changed .kilo/worktrees/ to .worktrees/ for tool-agnostic worktree paths
• ready-to-merge.mdc: Changed globs: "*.py" to alwaysApply: true (operates on PR metadata, not Python files)
• new-issues.mdc: Changed globs: "README.md" to alwaysApply: true (operates on feature matrix and GitHub issues)
• bench.mdc: Changed globs: "*.py" to globs: "benchmarks/**/*.py" (targets benchmark files specifically)
• release-major.mdc, release-minor.mdc, release-patch.mdc: Changed globs: "" to alwaysApply: true (release workflows are not file-scoped)

Dismissed findings:

• Release rule duplication (major/minor/patch): Cursor does not support shared base rules or parameterized rules, so the duplication is necessary and acceptable