feat(skills): add systematic debugging skill

[pertrai1-bot]

Summary

• Add skills/systematic-debugging/SKILL.md with a four-phase root-cause debugging workflow
• Document the new skill in the README skills section
• Add the new skill to AGENTS, CLAUDE, and Copilot instruction templates

Verification

• Ran skill/frontmatter validation for all skills
• Checked no disallowed {{PLACEHOLDER}} markers exist in directives/ or skills/
• Ran git diff --check

Notes

• Commit uses Commitizen-compatible Conventional Commits format: feat(skills): add systematic debugging skill

Summary by CodeRabbit

• Documentation
  • Added comprehensive "Systematic Debugging" guidance: a four-phase, evidence-focused process (reproduce/observe, localize, form/test a single hypothesis, implement/verify fix) plus output-handling and quick-reference aids.
  • Updated README and instruction templates to require and reference the new systematic debugging guidance for handling bugs, failing tests, CI issues, and regressions.

[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

Run ID: f7a18707-d6f4-423a-a94f-da08d9485205

📥 Commits

Reviewing files that changed from the base of the PR and between 2a18252 and 9947d0a.

📒 Files selected for processing (1)

• skills/systematic-debugging/SKILL.md

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📝 Walkthrough

Walkthrough

A new "Systematic Debugging" skill is introduced to enforce root-cause-driven debugging workflows. The skill is documented in a dedicated SKILL.md file, added to the README's skills table, and integrated into agent/template configurations (templates/AGENTS.md, templates/CLAUDE.md, templates/copilot-instructions.md).

Changes

Cohort / File(s)	Summary
Documentation & README README.md	Updated "What's Included" table to add "systematic debugging" and added a new section describing the four-phase debugging process (reproduce, localize, hypothesize, fix).
New Systematic Debugging Skill skills/systematic-debugging/SKILL.md	Added comprehensive skill doc defining scope/when-to-use, a four-phase root-cause workflow, output-handling lifecycle, "Rule of Three", forbidden-patterns, handoff/PR summary template, and a phase→output quick-reference.
Agent & Template Configuration templates/AGENTS.md, templates/CLAUDE.md, templates/copilot-instructions.md	Inserted Systematic Debugging into the mandatory Skills lists of agent/template docs, pointing to the new SKILL.md; no runtime or API changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat: add self-audit skill #2 — Follows the same pattern of adding a new skill document and updating agent/template files to require that skill.

Poem

🐰 I sniff the stack where the bug likes to hide,

I trace each hop with a twitch and a stride,
Reproduce, localize, test one bright thought,
Fix the root, not a patch that was bought,
Hop off satisfied — the rabbit debugged right! 🥕

🚥 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 PR title clearly and accurately summarizes the main change: adding a new systematic debugging skill to the repository.
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 feat/add-systematic-debugging-skill

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