docs: complete Phase 9 backlog triage (issues map, briefs, ADRs)

Map design IDs to Gitea #1-#37, add tasks 80-88, stub ADRs 0004-0006,
and point STATUS at the P1 batch order.

docs/tasks/84-back-navigation.md

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+# 84 — Back navigation on detail pages
+
+## Goal
+
+Audit detail routes lacking back affordances and add a shared header/back pattern consistently.
+
+## Why
+
+Individual plant pages (and other detail routes) have no in-page "back" except global nav.
+
+## Depends on
+
+- Existing app routes under `src/app/`
+
+## Scope
+
+- Audit all routes in `src/app/` for detail pages missing back; list them in the PR description.
+- Shared back affordance (header/back component).
+- Apply consistently to plant, note, list, and other detail pages.
+- Playwright: `tests/e2e/navigation.spec.ts` or per-module — Back visible and returns to parent.
+
+## Out of scope
+
+- Redesigning global nav or dashboard tabs.
+
+## Acceptance criteria
+
+- [ ] Audit list included in PR.
+- [ ] Shared back control on detail pages.
+- [ ] E2E covers representative detail routes.
+
+## Notes
+
+- Gitea: [ginnoir/famapp#6](https://gitea.ginnoir.com/ginnoir/famapp/issues/6)