README: add the DeepWiki badge

[spydisec]

Adds the DeepWiki badge to the README badge row, after the licence badge. The site home page includes the README, so it appears there too.

• mkdocs build --strict passes.
• Local CodeRabbit review: no findings.

🤖 Generated with Claude Code

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Summary by CodeRabbit

• Documentation
  • Added an Ask DeepWiki badge to the README header, providing a direct link to the project’s documentation.

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Team

Run ID: fba0eecb-88d5-4dc3-93c6-99fca5b83b6e

📥 Commits

Reviewing files that changed from the base of the PR and between 9d2e053 and f933610.

📒 Files selected for processing (1)

• README.md

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

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Walkthrough

The README header now includes an Ask DeepWiki badge that links to the project’s DeepWiki documentation.

Changes

README Documentation

Layer / File(s)	Summary
Add Ask DeepWiki badge README.md	The README header adds an Ask DeepWiki badge and documentation link.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to f9336

The README now adds a DeepWiki badge linking to project documentation. This documentation-only change has no remaining merge-readiness risk.

🚥 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 and concisely describes the README-only change: adding the DeepWiki badge.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/deepwiki-badge

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