[docs/process] PRD: initial full codebase inventory & review report

[mfittko]

Summary

Perform a one-off, lightweight governance pass to create an initial inventory/review of the codebase and commit a Markdown report under docs/reviews/.

Source doc: docs/issues/planned/prd-full-inventory-review.md

Tasks

• Create docs/reviews/ (if missing)
• Produce the initial review report docs/reviews/review-PRs-<start>-to-<end>.md
• Run and record health checks (tests, lint, CI coverage command)
• Capture key findings + follow-ups (link to issues where needed)
• Ensure checklist template is included and filled out

Acceptance Criteria

• A review report exists under docs/reviews/ following the filename convention
• Report includes pass/fail/notes for tests, lint, coverage and key packages
• Follow-ups are documented as actionable items