ci: enable the PR readiness helper

[Joibel]

Motivation

The PR readiness helper merged with DRY_RUN: "true" so its decisions could be verified from job summaries on real PRs before it started posting. This PR takes it live.

Modifications

• Flip DRY_RUN from "true" to "false" in .github/workflows/pr-readiness.yaml, so the helper now posts its sticky comment and moves not-ready PRs to draft instead of only rendering to the job summary.
• Update the README's "Dry run & rollout" section to describe dry-run as a testing tool rather than a pending rollout step.

Verification

No logic changes — the flag is read by the existing, unit-tested workflow steps, and the dry-run phase exercised the same code path end to end on real PRs.

Documentation

.github/pr-readiness/README.md updated to match the live state.

AI

This PR was prepared with Claude Code (workflow edit, README update, and this description).

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Generated by Claude Code

Summary by CodeRabbit

• New Features

  • Enabled live pull request comments and draft conversion by default in the readiness workflow.
  • Added guidance for enabling dry-run mode when simulated results are preferred.

• Documentation

  • Updated dry-run documentation to describe simulated comments and decisions shown in the workflow summary.

[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 Plus

Run ID: f6bbf8e1-904f-4958-ba23-3cf7fc5d3c1e

📥 Commits

Reviewing files that changed from the base of the PR and between 47a7a08 and db926e8.

📒 Files selected for processing (2)

• .github/pr-readiness/README.md
• .github/workflows/pr-readiness.yaml

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📝 Walkthrough

Walkthrough

The PR readiness workflow now enables live commenting and draft conversion by default. The documentation now describes only the behavior that occurs when DRY_RUN is enabled.

Changes

PR readiness workflow

Layer / File(s)	Summary
Update workflow mode and dry-run documentation .github/workflows/pr-readiness.yaml, .github/pr-readiness/README.md	The workflow changes DRY_RUN from "true" to "false" and updates the comments. The README removes rollout instructions and documents dry-run behavior.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: enabling the PR readiness helper.
Description check	✅ Passed	The description covers motivation, modifications, verification, documentation, and AI use; it omits only the issue reference.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/pr-readiness-helper-lt4r0y

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