docs: promote managed Reflexio trial

[yyiilluu]

Summary

• Connect open-source users with the hosted Reflexio platform through a prominent README call to action.
• Make the free entry point and included 30-day Pro trial immediately visible.

Changes

• Add a top-of-README managed-platform callout linking to Reflexio.ai.
• Highlight enhanced retrieval and continuous RL-driven improvement available on the managed platform.

Test Plan

• Ran git diff --check.
• Reviewed the rendered Markdown structure and verified the CTA link target.

Summary by CodeRabbit

• Documentation
  • Added information about managed Reflexio.
  • Included a free signup link and details about the 30-day Pro trial.

[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: Pro

Run ID: 96bfdf8b-2bfe-447d-9364-8e8c98351b0f

📥 Commits

Reviewing files that changed from the base of the PR and between 199a4b8 and 7cd6f98.

📒 Files selected for processing (1)

• README.md

Included review availability: 2 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 4 reviews per hour.

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📝 Walkthrough

Walkthrough

README.md adds a section that promotes managed Reflexio, links to Reflexio.ai, and describes the free signup and 30-day Pro trial.

Changes

Managed Reflexio promotion

Layer / File(s)	Summary
Managed Reflexio README section README.md	Adds a signup link and describes hosted features, enhanced retrieval, and continuous RL-driven improvement.

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

Merge Risk: ⚪ Minimal · up to 7cd6f

This localized documentation change adds a managed-platform call to action without introducing actionable merge-blocking risk; it is ready to merge after normal checks and review.

Suggested reviewers: guangyu-reflexio, yilu331

🚥 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 main change: promoting the managed Reflexio trial in the README.
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.

Full details: Docstring Coverage

Explanation

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 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/docs-managed-platform-trial

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