refactor(backend): separate runtime artifacts from source tree

[Benedict315]

Problem

Generated and runtime artifacts (audit logs, coverage reports) were being written directly into source directories, polluting the backend source tree with transient files.

Solution

• Created backend/reports/ directory as a dedicated location for runtime artifacts
• Updated eventStore.ts and report.ts to output to backend/reports/ instead of backend/src/audit-trail/
• Updated .gitignore to exclude generated artifacts from the source tree while keeping the reports directory tracked via .gitkeep
• Updated README.md to document the new artifact locations

Changes

• Created: backend/reports/.gitkeep
• Modified: .gitignore - added patterns for runtime artifacts
• Modified: backend/src/audit-trail/eventStore.ts - changed log output path
• Modified: backend/src/audit-trail/report.ts - changed report output path
• Modified: backend/src/audit-trail/README.md - documented artifact locations

Verification

• No CI impact - coverage and build outputs remain unaffected
• Code automatically creates reports/ directory if missing
• Existing .gitignore patterns for coverage/ and dist/ remain intact

Closes issue #477

Summary by CodeRabbit

• Documentation

  • Added audit trail system documentation detailing generated runtime artifacts and their storage locations.

• Chores

  • Reorganized backend artifact storage to a centralized reports directory.
  • Updated configuration to exclude generated backend artifacts and coverage data from version control.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The PR reorganizes audit trail runtime artifacts from the source tree into a dedicated backend/reports/ directory. It updates .gitignore to exclude reports and audit files, adds a .gitkeep file to track the new directory, and modifies audit-trail module paths to write artifacts to the new location.

Changes

Cohort / File(s)	Summary
Audit Artifact Directory Structure .gitignore, backend/reports/.gitkeep, backend/src/audit-trail/README.md	Updated .gitignore to exclude backend/reports/ and audit-specific output files while preserving the directory via .gitkeep. Added documentation describing audit trail runtime artifacts and their storage location.
Audit Trail Module Path Updates backend/src/audit-trail/eventStore.ts, backend/src/audit-trail/report.ts	Migrated audit log path from module-local to ../../reports/audit.log and report output path to ../../reports/audit-report.json. Both modules now verify/create the target reports directory at initialization before writing.
Removed Artifacts backend/src/audit-trail/audit-report.json	Deleted previously stored audit report sample containing metadata and event summary.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related issues

• Issue #477: The changes directly address relocating audit trail runtime artifacts from source tree to backend/reports/, including creation of .gitkeep, updates to .gitignore, audit-trail README documentation, and path modifications in audit-trail source files.

Poem

🐰 Hop hop, files now roam free,
To reports directory they flee,
Audit logs find their nest,
Away from source—what's best!
Tidy burrows, tidy trees. 🌱

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title 'refactor(backend): separate runtime artifacts from source tree' accurately and specifically summarizes the main change: moving generated runtime artifacts out of the source directories into a dedicated backend/reports/ directory.
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

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@backend/src/audit-trail/eventStore.ts`:
- Around line 5-6: The retention logic is pointed at the old file path; update
enforceRetention() in retention.ts to use the same audit log location as
eventStore (either import LOG_PATH from eventStore.ts or compute path using
REPORTS_DIR: path.join(__dirname, '..', '..', 'reports', 'audit.log')) so the
function reads backend/reports/audit.log and correctly applies retention to real
audit data.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8fa76123-d1ec-48bd-89b4-5136b1c31c10

📥 Commits

Reviewing files that changed from the base of the PR and between b356a85 and 935f139.

📒 Files selected for processing (6)

• .gitignore
• backend/reports/.gitkeep
• backend/src/audit-trail/README.md
• backend/src/audit-trail/audit-report.json
• backend/src/audit-trail/eventStore.ts
• backend/src/audit-trail/report.ts

💤 Files with no reviewable changes (1)

• backend/src/audit-trail/audit-report.json