docs(wren): rebrand README to Wren AI and expand rename migration note

[goldmedal]

Summary

Follow-up to #2315 (PyPI rename wren-engine → wrenai). Polishes core/wren/README.md:

• Rebrand tagline: "Wren Engine CLI and Python SDK" → "Wren AI CLI and Python SDK" to align with the unified Wren AI brand
• Expand the rename migration section that was added in chore(wren)!: rename PyPI package from wren-engine to wrenai #2315:
  • Lead with the why (brand alignment)
  • Add a "What stays the same" list (import path, CLI, extras, ~/.wren/ config) so users can scan and confirm their code doesn't need touching
  • Migration block now includes a wren --version sanity check + a note for projects pinning wren-engine in lockfiles or requirements.txt

PyPI distribution names (wren-engine / wrenai) are kept verbatim wherever they appear in install / uninstall commands — the rebrand only swaps the human-readable brand name.

Test plan

• Render the README on GitHub and visually check the new section
• Confirm no other Wren Engine brand references remain in core/wren/README.md (only PyPI distribution name wren-engine should remain, in migration commands)

Summary by CodeRabbit

• Documentation
  • Updated branding to "Wren AI CLI" and adjusted the "Powered by" attribution to reference Apache DataFusion.
  • Clarified package rename to "wrenai" starting with 0.7.0 and noted legacy project freeze at 0.6.x.
  • Expanded migration guidance (check CLI version and re-lock any pinned dependencies) and listed what remains unchanged during the transition.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 9cf27bf6-2bfe-4ea8-a5d9-e14caa6dc7a9

📥 Commits

Reviewing files that changed from the base of the PR and between 090b5d0 and c99592a.

📒 Files selected for processing (1)

• core/wren/README.md

✅ Files skipped from review due to trivial changes (1)

• core/wren/README.md

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Walkthrough

The core/wren/README.md is updated: the tagline now reads "Wren AI CLI," the "Powered by" line references Apache DataFusion only, and the "Package rename: wren-engine → wrenai" section is rewritten to specify the 0.7.0 timeline, legacy freeze at 0.6.x, a "What stays the same" list, and updated migration steps including wren --version.

Changes

Package rename and branding documentation

Layer / File(s)

Summary

Product branding and migration guidance core/wren/README.md

Product tagline changed to "Wren AI CLI." "Powered by" now references Apache DataFusion only. Package rename section rewritten to state the rename starts at 0.7.0, legacy wren-engine frozen at 0.6.x, adds a "What stays the same" list (Python import wren, wren CLI/subcommands, PyPI extras, ~/.wren/ config), and updates migration steps to include wren --version verification and re-locking pinned wren-engine deps to wrenai.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Canner/WrenAI#2315: Updates to the same core/wren/README.md file reflecting the wren-engine → wrenai PyPI package rename with overlapping branding and migration messaging.

Suggested reviewers

• PaulChen79
• douenergy

Poem

🐰 A hop through README lines so bright,
"Engine" whispers low, "AI" takes flight.
wrenai arrives with clear step and tune,
wren --version hums beneath the moon.
A tiny rabbit cheers this doc's new light! 🌟

🚥 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 summarizes the main change: rebranding the README from 'Wren Engine' to 'Wren AI' and expanding the migration notes for the rename.
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 chore/wren-readme-rebrand

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