Add deterministic project detection

[KingEmma7]

What changed

• adds a deterministic cursor-os detect command for repository stack, tooling, paths and marker discovery
• reuses detection during project initialization so generated context reflects the actual repository
• expands smoke coverage across representative fixtures and packaged-install behavior
• updates CI, contributor guidance, release checks, memory, decision records and user documentation
• keeps Nx/Turborepo configuration as tooling evidence without misclassifying single-package projects as monorepos

Why

Project setup previously depended too heavily on manual description and could drift from repository facts. A single deterministic detector gives initialization, users and automation the same evidence-based project model.

Review identified that nx.json and turbo.json prove task-runner use, not a multi-package workspace. Monorepo classification is now reserved for actual workspace declarations while task-runner detection remains available separately.

Impact

Cursor OS can now identify common project characteristics without executing repository code or relying on network services. The output is stable enough for scripts while remaining readable for developers, and localization will not be misdirected by standalone Nx or single-package Turborepo configurations.

Validation

• complete project smoke suite — 159 checks passed
• packaged tarball end-to-end installation and detection smoke test
• GitHub Actions passed on reviewed head 11ed5e8

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: f063ddc1b9

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".