Fix GitHub release version detection

[MikeMcQuaid]

• Prefer numeric release tags over asset filename versions.
• Audit equivalent versions with different string forms.

Fixes #23336.

---

• Have you followed our Contributing guidelines?
• Have you checked for other open Pull Requests for the same change?
• Have you explained what your changes do? Performance claims (e.g. "this is faster") must include Hyperfine benchmarks.
• Have you explained why you'd like these changes included, not just what they do?
• For bug fixes, have you given step-by-step brew commands to reproduce the bug?
• Have you written new tests (excluding integration tests)? Here's an example.
• Have you successfully run brew lgtm (style, typechecking and tests) locally?

---

• AI was used to generate or assist with generating this PR.

OpenAI Codex 5.6 Sol xhigh with local review and testing.

---

[Copilot]

Pull request overview

This pull request fixes Homebrew’s version inference for GitHub “releases/download” URLs by preferring the numeric release tag version (e.g., v3.2) over versions embedded in asset filenames (e.g., hstr-3.2.0-...). It also tightens formula auditing to catch “equivalent but differently formatted” version changes (e.g., 1.0 → 1.0.0) that can cause operational mismatches.

Changes:

• Add a GitHub releases URL parser to detect versions from numeric release tags earlier in the parser chain.
• Add a version detection spec asserting that the release tag takes precedence over the asset filename.
• Update the formula auditor to flag stable version “format-only” changes (same comparable version, different string form) and add coverage for it.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
Library/Homebrew/version.rb	Adds an early GitHub releases URL parser to prioritize numeric release tag versions.
Library/Homebrew/test/version_spec.rb	Adds a regression test ensuring the release tag version is chosen over the asset filename version.
Library/Homebrew/formula_auditor.rb	Audits and reports stable version changes that only alter string formatting (e.g., 1.0 → 1.0.0).
Library/Homebrew/test/formula_auditor_spec.rb	Adds a spec asserting the new “format-only version change” audit behavior.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.