docs(10-01): complete intro-section and step-descriptions plan

- SUMMARY.md with full execution record
- STATE.md: progress updated, 3 decisions added, session recorded
- ROADMAP.md: phase 10 progress updated (1/3 summaries)
- REQUIREMENTS.md: UX-01 and UX-03 marked complete
- deferred-items.md: pre-existing RemoteConfigStep test failures logged

.planning/phases/10-content-clarity/deferred-items.md

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+# Deferred Items — Phase 10
+
+## Pre-existing test failures (out of scope for 10-01)
+
+**Discovered during:** Plan 10-01, Task 2 verification
+**Files involved:** `src/schemas/registry.ts` (uncommitted working tree changes) + `src/components/wizard/RemoteConfigStep.test.tsx` (working tree)
+**Status:** NOT caused by plan 10-01 changes
+
+**Details:** 8 RemoteConfigStep tests fail when the uncommitted `registry.ts` changes (tooltip texts added for GCS and B2 fields from a previous session) are combined with the current `RemoteConfigStep.test.tsx`. The tests time out waiting for GCS/B2 fields (`getByLabelText(/project number/i)`) and S3/GCS validation labels. These changes were in the working tree before plan 10-01 execution began and are unrelated to the intro section or step description work.
+
+**Failing tests:**
+- `renders Project Number field`
+- `renders Service Account JSON field`
+- `renders Application Key ID field`
+- `renders Application Key field`
+- `accepts valid S3 region (no format error)`
+- `rejects GCS project_number with non-digits`
+- `accepts valid GCS project_number (no format error)`
+- `rejects S3 region with invalid format (spaces)` (intermittent)
+
+**Recommended fix:** Commit or revert the uncommitted `registry.ts` changes and align `RemoteConfigStep.test.tsx` selectors with the updated tooltip rendering (likely a `{ selector: 'input' }` issue).