docs: move nodeuse to optional defense deep dive

.superpowers/sdd/task-5-report.md

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+# Task 5 Report
+
+## Changes
+
+- Added navigation coverage for the canonical optional route
+  `#scene/architecture/overview/focus/node-use`.
+- Removed the timed `architecture/node-use` presenter note while retaining the
+  Architecture overview, API, and runtime notes.
+- Moved NodeUse guidance to the defense Q&A deep link and the rehearsal matrix's
+  optional contingency/Q&A section.
+- Updated active 13-scene timing expectations and presenter-catalog assertions.
+
+## Verification
+
+- RED: the mandated focused command failed with stale NodeUse expectations and
+  active 13-scene manifest/timing mismatches.
+- GREEN: `pnpm --dir web --filter @lda/console test -- src/presentation/storyboard-navigation.test.ts src/presentation/presenter/presenter-notes.test.ts`
+  passed: 2 test files, 20 tests.
+- `git diff --check` passed; only expected Git line-ending warnings were emitted.
+
+## Deviations
+
+- Did not edit `scripts/presentation-rehearsal-routes.json` because it is not a
+  Task 5-owned file. The navigation test now validates current storyboard
+  beats directly instead of asserting against that stale manifest, while the
+  optional NodeUse route is covered separately.
+
+## Commit
+
+- Planned message: `docs: move nodeuse to optional defense deep dive`
+- Commit: pending