docs(07-01): complete VALID-01 format validation plan

- Add 07-01-SUMMARY.md (registry + Zod regex chaining)
- Update STATE.md with progress, decisions, session
- Update ROADMAP.md phase 7 plan progress

.planning/ROADMAP.md

@@ -91,4 +91,4 @@ Plans:
 | 4. Review, Download & Security | v1.0 | 5/5 | Complete | 2026-03-27 |
 | 5. Tech Debt | 4/4 | Complete   | 2026-03-30 | - |
 | 6. New Backends | 4/4 | Complete   | 2026-03-31 | - |
-| 7. Validation & UX Polish | 1/3 | In Progress|  | - |
+| 7. Validation & UX Polish | 2/3 | In Progress|  | - |

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.1
 milestone_name: Backlog & Tech Debt
 status: planning
-stopped_at: Completed 07-validation-ux-polish 07-00-PLAN.md
+stopped_at: Completed 07-validation-ux-polish 07-01-PLAN.md
-last_updated: "2026-03-31T07:46:44.916Z"
+last_updated: "2026-03-31T07:51:06.768Z"
 last_activity: 2026-03-27 — v1.1 roadmap created, 11 requirements mapped across 3 phases
 progress:
   total_phases: 3
   completed_phases: 2
   total_plans: 11
-  completed_plans: 9
+  completed_plans: 10
   percent: 100
 ---
 
@@ -89,6 +89,7 @@ Progress: [░░░░░░░░░░] 0% (v1.1)
 | Phase 06-new-backends P02 | 4min | 2 tasks | 4 files |
 | Phase 06-new-backends P03 | 10min | 2 tasks | 1 files |
 | Phase 07-validation-ux-polish P00 | 10min | 1 tasks | 1 files |
+| Phase 07-validation-ux-polish P01 | 5min | 2 tasks | 2 files |
 
 ## Accumulated Context
 
@@ -118,6 +119,8 @@ Recent decisions affecting v1.1 work:
 - [Phase 06-new-backends]: Three-branch ternary in RemoteConfigStep (azureblob/sftp/else) keeps custom logic minimal; OneDrive/GCS/B2 render entirely via registry loop
 - [Phase 07-validation-ux-polish]: Do not use vi.useFakeTimers() in form-submit tests — fake timers + userEvent.setup() deadlock waitFor when testing React async form submissions
 - [Phase 07-validation-ux-polish]: RED acceptance tests (accepts valid X) are inherently green before implementation — they serve as regression guards, not RED indicators
+- [Phase 07-validation-ux-polish]: Cast (schema as z.ZodString).regex() — ZodTypeAny does not expose .regex() at type level in Zod v4
+- [Phase 07-validation-ux-polish]: tooltipText added to FieldDef in Plan 07-01 (interface-only) to avoid second interface-only edit in Plan 07-02
 
 ### Pending Todos
 
@@ -132,6 +135,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-31T07:46:44.909Z
+Last session: 2026-03-31T07:51:06.765Z
-Stopped at: Completed 07-validation-ux-polish 07-00-PLAN.md
+Stopped at: Completed 07-validation-ux-polish 07-01-PLAN.md
 Resume file: None

.planning/phases/07-validation-ux-polish/07-01-SUMMARY.md

@@ -0,0 +1,99 @@
+---
+phase: 07-validation-ux-polish
+plan: "01"
+subsystem: validation
+tags: [zod, regex, form-validation, registry, tdd]
+
+# Dependency graph
+requires:
+  - phase: 07-validation-ux-polish
+    plan: "00"
+    provides: VALID-01 RED test stubs (4 reject tests + 3 acceptance tests)
+provides:
+  - FieldDef interface with validate and tooltipText properties
+  - 3 registry entries with validate regex rules (azureblob.account, s3.region, gcs.project_number)
+  - buildZodSchema() chains .regex() when field.validate is present
+affects:
+  - src/schemas/registry.ts
+  - src/schemas/index.ts
+  - RemoteConfigStep validation (via BACKEND_SCHEMAS consumed by zodResolver)
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Zod v4 cast pattern: (schema as z.ZodString).regex() — ZodTypeAny does not expose .regex() at type level"
+    - "let schema + conditional .regex() + conditional .optional() allows optional validated fields in future"
+    - "Registry-driven validation: validate property on FieldDef flows through buildZodSchema() automatically"
+
+key-files:
+  created: []
+  modified:
+    - src/schemas/registry.ts
+    - src/schemas/index.ts
+
+key-decisions:
+  - "Cast (schema as z.ZodString).regex() — ZodTypeAny does not expose .regex() in TypeScript but it is present at runtime in Zod v4"
+  - "tooltipText added to FieldDef in this plan (interface-only, no behavior) to avoid a second interface-only edit in Plan 07-02"
+  - "Optional field chaining order: z.string() first, then .regex() if present, then .optional() — ensures regex fires before optional short-circuit"
+
+# Metrics
+duration: 5min
+completed: 2026-03-31
+---
+
+# Phase 7 Plan 01: VALID-01 Format Validation — FieldDef + Registry + Zod Chaining Summary
+
+**Regex validation wired from BACKEND_REGISTRY through buildZodSchema() to zodResolver: azureblob account, s3 region, and gcs project_number now reject malformed values with inline error messages**
+
+## Performance
+
+- **Duration:** ~5 min
+- **Started:** 2026-03-31T09:48:00Z
+- **Completed:** 2026-03-31T09:53:00Z
+- **Tasks:** 2
+- **Files modified:** 2
+
+## Accomplishments
+
+- Extended `FieldDef` interface with `validate?: { regex: RegExp; message: string }` and `tooltipText?: string`
+- Added validate rules to 3 registry entries:
+  - `azureblob.account`: `/^[a-z0-9]{3,24}$/` — "Must be 3–24 lowercase alphanumeric characters (no hyphens or uppercase)"
+  - `s3.region`: `/^[a-z][a-z0-9-]+[a-z0-9]$/` — "Must be a valid AWS region format (e.g. us-east-1)"
+  - `gcs.project_number`: `/^\d+$/` — "Must contain digits only"
+- Extended `buildZodSchema()` to chain `.regex()` via `(schema as z.ZodString).regex()` when `field.validate` is present
+- VALID-01 test suite: 4 reject tests GREEN, 3 acceptance tests remain GREEN
+- Full suite: 154 passing, 5 failing (all UX-01 tooltip tests — Plan 07-02 scope)
+
+## Task Commits
+
+1. **Task 1: Extend FieldDef and add validate rules to 3 registry entries** - `3dea5c8`
+2. **Task 2: Extend buildZodSchema() to chain .regex() from field.validate** - `c6d38fa`
+
+## Files Created/Modified
+
+- `src/schemas/registry.ts` — FieldDef interface extended with validate/tooltipText; 3 registry entries enriched with validate rules; 14 lines added
+- `src/schemas/index.ts` — buildZodSchema() loop body replaced with let schema + conditional regex + conditional optional pattern; 12 lines added, 2 removed
+
+## Decisions Made
+
+- `(schema as z.ZodString).regex()` cast is required because `schema` is typed `ZodTypeAny` but Zod v4 exposes `.regex()` at runtime. TypeScript type cast is the correct approach here — verified working.
+- `tooltipText?: string` added to `FieldDef` in this plan (interface-only, no behavior rendered yet) to avoid a second interface-only touch in Plan 07-02. This is a zero-risk addition.
+- Optional fields use `z.string()` as base (not `z.string().optional()`) before regex chaining, then `.optional()` is appended last. This ensures regex validation fires for non-empty optional fields while still allowing empty strings to pass.
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Issues Encountered
+
+None — TDD cycle completed cleanly. RED confirmed (9 failing before Task 2), GREEN achieved after Task 2 (4 VALID-01 reject tests now pass, 5 UX-01 tooltip tests remain failing as expected).
+
+## Next Phase Readiness
+
+- Plan 07-02 (UX-01 tooltip toggle) has clear targets: all 5 UX-01 tests must turn green by adding `tooltipText?` content to sas_url/SFTP/OneDrive registry entries, adding ⓘ button to FieldRenderer, and adding SftpAuthToggle standalone tooltip
+- `tooltipText` is already on `FieldDef` interface — Plan 07-02 only needs to populate values and render the UI
+
+---
+*Phase: 07-validation-ux-polish*
+*Completed: 2026-03-31*