chore(ci): rename PR welcome workflow and add code of conduct

[Atliac]

• Rename .github/workflows/pr-welcome.yml to pr-guidance.yml
• Add standard CODE_OF_CONDUCT.md to the repository

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 92405933-2bda-445a-946f-86ee36f1a671

📥 Commits

Reviewing files that changed from the base of the PR and between 6260367 and 03d8bc6.

📒 Files selected for processing (1)

• .github/workflows/pr-guidance.yml

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📝 Walkthrough

Summary by CodeRabbit

• Documentation

  • Added a complete Code of Conduct (Contributor Covenant) covering community standards, reporting expectations, and enforcement approach.

• Chores

  • Introduced a new automated pull request guidance comment that posts structured review-time instructions and only posts once per pull request.
  • Removed the older pull request welcome automation to avoid sending outdated guidance comments.

Walkthrough

Removes .github/workflows/pr-welcome.yml and replaces it with a new .github/workflows/pr-guidance.yml workflow that posts an expanded automated guidance comment on PRs. Also adds a CODE_OF_CONDUCT.md implementing the Contributor Covenant.

Changes

Repository Community Health Files

Layer / File(s)	Summary
PR guidance workflow trigger and permissions .github/workflows/pr-guidance.yml	Workflow triggers on pull_request_target for opened and ready_for_review events with contents: read and issues: write permissions.
Comment deduplication and context setup .github/workflows/pr-guidance.yml	Job script extracts the PR number from the event payload, lists existing issue comments, detects an existing Atliac-signed automated message to prevent duplicates, and computes the documentation base URL from the PR base branch.
Guidance message construction and posting .github/workflows/pr-guidance.yml	Builds a multi-section Markdown body with welcome header, contributor checklist, collapsible <details> blocks for contributors, community reviewers, and maintainers (including shell/CLI examples), a "Helpful Resources" section, signature footer, and posts the comment via github.rest.issues.createComment.
Code of Conduct CODE_OF_CONDUCT.md	Adds the full Contributor Covenant Code of Conduct with pledge, standards, scope, enforcement responsibilities, enforcement guidelines, and a placeholder reporting contact method.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• Atliac/crate-template#5: Introduced the original pr-welcome.yml workflow using the same duplicate-detection pattern (checking for the Atliac-signed comment before posting), which this PR supersedes with pr-guidance.yml.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the two main changes: renaming the PR welcome workflow to pr-guidance and adding a code of conduct file.
Description check	✅ Passed	The description directly relates to the changeset, listing the two primary changes: workflow rename and addition of CODE_OF_CONDUCT.md.
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 pr-guidance

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 4

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: b9797bec-8e91-49c5-bce4-bbc5542d13ab

📥 Commits

Reviewing files that changed from the base of the PR and between 6cb7d2f and 97e1d0e.

📒 Files selected for processing (3)

• .github/workflows/pr-guidance.yml
• .github/workflows/pr-welcome.yml
• CODE_OF_CONDUCT.md

💤 Files with no reviewable changes (1)

• .github/workflows/pr-welcome.yml