docs: de-dash README prose (modernization)

[ascender1729]

Removes em/en-dashes from README prose (replaced with commas/colons/periods/parentheses). Version refs verified current against Attestix core 0.4.0. Docs-only, no code.

Summary by CodeRabbit

• Documentation
  • Updated README formatting for improved clarity and readability throughout the documentation.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 008be6eb-cc95-41d0-8203-f00bcf4ffc3d

📥 Commits

Reviewing files that changed from the base of the PR and between 9f9b153 and 2427548.

📒 Files selected for processing (3)

• CODE_OF_CONDUCT.md
• CONTRIBUTING.md
• SECURITY.md

📝 Walkthrough

Walkthrough

Four punctuation edits in README.md replace em-dashes with parentheses, a comma, and colons in the Offline verifier description, the Verify() sentence, the canonicalization note, and the test-suite verdict list. No functional, API, or behavioral changes.

Changes

README Typography Fixes

Layer / File(s)	Summary
README punctuation changes README.md	Em-dashes replaced: Offline verifier description now uses parentheses; Verify() sentence uses a comma; canonicalization note uses a colon; test-suite VC verify and UCAN chain entries use colons.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A rabbit hops through punctuation's maze,
Swapping dashes for colons and commas today,
No em-dash shall linger where a colon can stay,
The README shines brighter in typographic ways,
🐇✨ Neat and tidy — wait, make that: neat and tidy!

🚥 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 'docs: de-dash README prose (modernization)' directly and accurately describes the main change: removing dashes from README documentation. It is concise, clear, and specific.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/docs-deslop-modernize

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