Simplify model description in README

[flyingrobots]

Removed mention of replay and historical coordinates from the model description.

Summary

Test plan

ADR checks

• This PR does not implement ADR 2 without satisfying ADR 3
• If this PR touches persisted op formats, I linked the ADR 3 readiness issue
• If this PR touches wire compatibility, I confirmed canonical-only ops are still rejected on the wire pre-cutover
• If this PR touches schema constants, I confirmed patch and checkpoint namespaces remain distinct

Summary by CodeRabbit

• Documentation
  • Updated README introduction text for improved clarity and readability.

[coderabbitai]

📝 Walkthrough

Walkthrough

The README's introductory sentence describing the model was shortened by removing the phrase ", not bolted-on afterthoughts," leaving a more concise description that ends with "are part of the model."

Changes

Documentation Update

Layer / File(s)	Summary
README introductory sentence README.md	The opening description of the model was shortened by removing the trailing qualifier "not bolted-on afterthoughts," making the sentence more concise.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A word here, a phrase there we trim,
The model shines bright, no longer grim,
Short and sweet, the sentence now reads,
Clear as day—exactly what reviewers need! 🐰✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is incomplete. The Summary and Test plan sections are empty (only contain template comments), and ADR checks are all unchecked with no justification provided.	Fill in the Summary section with 1-3 bullet points describing the change, add a Test plan explaining how this was tested, and address the ADR checks with explanations for why they don't apply.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: simplifying the model description in the README by removing unnecessary phrases.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch flyingrobots-patch-1

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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 `@README.md`:
- Around line 13-14: Update the README sentence that currently reads "and
observers. Provenance, replay, and explicit historical coordinates are part of
the model." to remove the terms "replay" and "historical coordinates" so the
text matches the PR objective; edit the phrase (e.g., "Provenance and observers
are part of the model" or similar) and ensure the README no longer mentions
"replay" or "historical coordinates" anywhere in that paragraph.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

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

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4bdab107-4c1e-46d6-8c88-c90ab9c9ce8b

📥 Commits

Reviewing files that changed from the base of the PR and between 784e1bc and a6c3fd6.

📒 Files selected for processing (1)

• README.md

[github-actions]

Release Preflight

• package version: 17.0.0
• prerelease: false
• npm dist-tag on release: latest
• npm pack dry-run: passed
• jsr publish dry-run: passed

If you tag this commit as v17.0.0, release workflow will publish.