fix(build): migrate to stable dynamic metadata API

[njzjz-bot]

Summary:

• migrate project metadata configuration to the standard [[tool.dynamic-metadata]] interface introduced in scikit-build-core 1.0
• update the in-tree metadata provider to return project fragments using the v1 protocol
• require scikit-build-core>=1, opt into minimum-version = "1.0", and remove the obsolete experimental flag
• migrate the renamed CMake version environment setting to a valid version specifier

Supersedes #5759, which only widens the upper bound while retaining the deprecated metadata interface.

Fixes #3558

Validation:

• ruff check .
• ruff format .
• resolved the complete project metadata table with scikit-build-core 1.0.0, including version, optional dependencies, scripts, and readme
• built the source distribution successfully in an isolated environment with scikit-build-core 1.0.2

Coding agent: Codex
Codex version: codex-cli 0.144.1
Model: gpt-5.6-sol
Reasoning effort: xhigh

Summary by CodeRabbit

• Build & Packaging
  • Updated package metadata handling to support the standard provider configuration.
  • Improved compatibility with newer scikit-build-core releases.
  • Updated CMake version requirements used during builds.
  • Refined generation of optional dependencies and executable scripts from project configuration.
  • Removed support for the legacy entry-points metadata option.

[coderabbitai]

📝 Walkthrough

Walkthrough

The build backend now uses the standard v1 dynamic metadata provider protocol, returns namespaced metadata fragments, upgrades scikit-build-core configuration, and emits the new CMake version environment variable.

Changes

Dynamic metadata migration

Layer / File(s)	Summary
Dynamic metadata provider protocol backend/dynamic_metadata.py	The provider now accepts standard settings and project arguments, validates optional-dependencies and scripts, preserves fragment construction, and returns {field: result}.
Scikit-build-core v1 configuration pyproject.toml, backend/read_env.py	Build requirements and metadata providers use scikit-build-core v1 configuration, while CMake configuration emits SKBUILD_CMAKE_VERSION with a >= specifier.

Estimated code review effort: 3 (Moderate) | ~20 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: migrating build metadata handling to the stable dynamic metadata API.
Linked Issues check	✅ Passed	The PR addresses #3558 by moving to the stable API and unpinning scikit-build-core to version 1+.
Out of Scope Changes check	✅ Passed	The changes stay focused on metadata API migration, build config updates, and the related environment variable rename.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@pyproject.toml`:
- Around line 227-233: Update both tool.dynamic-metadata entries in the
pyproject configuration to use provider = "backend.dynamic_metadata" and add
provider-path = "."; preserve their existing field values, optional-dependencies
and scripts, respectively.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 3bfbc160-92db-46c3-af43-b5c45dde3613

📥 Commits

Reviewing files that changed from the base of the PR and between 7c362d7 and 187ba8b.

📒 Files selected for processing (3)

• backend/dynamic_metadata.py
• backend/read_env.py
• pyproject.toml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.52%. Comparing base (7c362d7) to head (187ba8b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5769      +/-   ##
==========================================
- Coverage   79.65%   79.52%   -0.13%     
==========================================
  Files        1015     1015              
  Lines      115781   115780       -1     
  Branches     4272     4275       +3     
==========================================
- Hits        92229    92079     -150     
- Misses      22008    22157     +149     
  Partials     1544     1544              

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