crate publishing workflow

[Copilot]

The automated publish workflow could only be triggered by pushing version tags, making it impossible to test changes to the workflow or validate a release without actually publishing to crates.io.

Changes

Workflow trigger

• Added workflow_dispatch with dry_run input (defaults to true)
• Skip tag version validation when manually triggered

Publish logic

• Pass --dry-run flag to cargo publish when enabled
• Skip crate availability polling in dry-run mode (no actual uploads)
• Visual indicators for mode: 🧪 DRY-RUN MODE vs 📦 LIVE MODE

Documentation

• RELEASING.md: Testing section with dry-run vs live comparison
• .github/TESTING_RELEASES.md: Step-by-step testing guide

Usage

Manual test without publishing:

# GitHub Actions UI → "Publish to crates.io" → "Run workflow"
# Branch: main, dry_run: true

Actual publish (unchanged):

git tag v0.46.0 && git push origin v0.46.0

Dry-run validates packaging, dependencies, and publish order across all 15 crates without uploading to the registry.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Automate crate publishing</issue_title>
<issue_description>## Is your feature request related to a problem? Please describe.
Automatically publish new versions to crates.io</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Automate crate publishing #752

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.55%. Comparing base (d2ec7d0) to head (189e92b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #755      +/-   ##
==========================================
- Coverage   90.69%   89.55%   -1.14%     
==========================================
  Files         459      459              
  Lines       85030    85030              
==========================================
- Hits        77115    76150     -965     
- Misses       7915     8880     +965     

Flag	Coverage Δ
miri	89.55% <ø> (-1.14%)	⬇️
unittests	89.39% <ø> (-1.26%)	⬇️

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see 39 files with indirect coverage changes

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[Copilot]

Pull request overview

This PR adds an automated crate publishing workflow for releasing DiskANN crates to crates.io. The workflow can be triggered manually via workflow_dispatch with a dry-run option (default: true) for testing, or automatically when pushing version tags matching v{major}.{minor}.{patch}. The implementation aims to enable safe testing of the release process without actual publication.

Changes:

• Added .github/workflows/publish.yml workflow with dual-trigger support (tags and manual dispatch)
• Added .github/PUBLISH_CRATES.md documentation describing the release process and testing procedures
• Implemented dry-run mode for testing packaging and validation without publishing

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 10 comments.

File	Description
.github/workflows/publish.yml	New GitHub Actions workflow that validates versions, runs tests, and publishes workspace crates with optional dry-run mode
.github/PUBLISH_CRATES.md	Comprehensive documentation covering prerequisites, dry-run testing, release steps, and pre-release checklist

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