Phase 4: Browse Frontend — Composition Rendering
Goal: Plan pages render child phases inline. Monolithic plans unchanged.
Completed: 2026-03-02 (PR #63, 2 QA rounds, 252 tests)
Forgejo: forgejo_admin/pal-e-docs PR #63, issue #62
Scope: routes/frontend.py, templates/note.html, templates/base.html, tests/test_composition_rendering.py
QA fix: Cartesian product from multiple joinedload on collections — switched to subqueryload.