feat: add bug-investigator Claude Code agent

[pokhiii]

Summary

• Add the bug-investigator Claude Code agent adapted from the engineering-recipes template with all placeholders replaced with Goonj-specific values (CiviCRM, WordPress, PHP 8.x, MySQL)
• Seed agent memory with known codebase patterns (service class architecture, entity subtypes, known code smells)
• Register the agent in CLAUDE.md alongside the existing implementation-planner

Test plan

• Verify .claude/agents/bug-investigator.md has correct YAML frontmatter (model: opus, color: red, memory: project)
• Verify all {{PLACEHOLDER}} values have been replaced with Goonj-specific content
• Verify CLAUDE.md Custom Agents table includes both implementation-planner and bug-investigator
• Test the agent by reporting a bug and confirming it launches and follows the 5-step investigation process

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added comprehensive bug investigation agent specification with systematic debugging workflows, issue analysis procedures, and investigation guidelines.
  • Added bug investigator agent memory documentation covering codebase patterns and common issue tracking references.

[coderabbitai]

Walkthrough

Three documentation files are added to define a new bug-investigator agent: an agent specification with a detailed investigation workflow, a memory file documenting codebase patterns and code patterns to watch for, and an index entry in CLAUDE.md.

Changes

Cohort / File(s)	Summary
Bug Investigator Agent Definition .claude/agents/bug-investigator.md	Comprehensive agent specification defining role, persona, investigation workflow (5 steps from behavior establishment through solution proposal and reporting), detailed reporting guidelines, and quality checks for bug investigation.
Agent Memory and Index .claude/agent-memory/bug-investigator/MEMORY.md, CLAUDE.md	Memory documentation capturing codebase patterns (service architecture, entity subtypes, hooks) and code patterns to monitor for bugs; index entry added to Custom Agents table.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• chore: add CLAUDE.md with project context and cross-repo issue tracki… #1559: Both PRs modify CLAUDE.md and introduce cross-repository issue-tracking documentation alongside agent specifications.

Suggested reviewers

• rathorevaibhav

Poem

🐛 A sleuth arrives with methodical grace,
Chasing bugs through code's intricate space,
Five steps to truth, from "why?" to "how"—
The bug-investigator knows the vow.
Patterns observed, solutions reviewed,
Root causes found, the codebase soothed. ✨

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: add bug-investigator Claude Code agent' accurately describes the main change—introducing a new bug-investigator agent with supporting documentation and registration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into dev

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch setup-bug-investigator-agent

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