docs(06-05): complete confirmation page + download route plan — SUMMARY, STATE, ROADMAP updated

- Post-signing confirmation page with success checkmark, document name, timestamp, 15-min download token
- GET /api/sign/[token]/download streams signedFilePath PDF via short-lived download JWT
- Phase 6 (signing flow) all 5 plans complete
- SIGN-06 requirement marked complete

.planning/REQUIREMENTS.md

@@ -47,7 +47,7 @@
 - [x] **SIGN-03**: Client opens the link in any browser and sees the prepared PDF with signature fields highlighted
 - [x] **SIGN-04**: Client can draw a freehand signature on a canvas (works on mobile and desktop)
 - [x] **SIGN-05**: Client can save a default signature and click a signature field to apply it without redrawing
-- [ ] **SIGN-06**: Client sees a confirmation screen after successfully signing
+- [x] **SIGN-06**: Client sees a confirmation screen after successfully signing
 - [ ] **SIGN-07**: Agent can download the signed PDF from the dashboard
 
 ### Legal & Compliance
@@ -130,7 +130,7 @@ Which phases cover which requirements. Updated during roadmap creation.
 | SIGN-03 | Phase 6 | Complete |
 | SIGN-04 | Phase 6 | Complete |
 | SIGN-05 | Phase 6 | Complete |
-| SIGN-06 | Phase 6 | Pending |
+| SIGN-06 | Phase 6 | Complete |
 | LEGAL-01 | Phase 6 | Complete |
 | LEGAL-02 | Phase 6 | Complete |
 | LEGAL-04 | Phase 6 | Pending |

.planning/ROADMAP.md

@@ -153,5 +153,5 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
 | 3. Agent Portal Shell | 4/4 | Complete   | 2026-03-19 |
 | 4. PDF Ingest | 4/4 | Complete   | 2026-03-20 |
 | 5. PDF Fill and Field Mapping | 3/4 | In Progress|  |
-| 6. Signing Flow | 4/6 | In Progress|  |
+| 6. Signing Flow | 5/6 | In Progress|  |
 | 7. Audit Trail and Download | 0/? | Not started | - |

.planning/STATE.md

@@ -8,7 +8,7 @@ progress:
   total_phases: 6
   completed_phases: 5
   total_plans: 24
-  completed_plans: 22
+  completed_plans: 23
 ---
 
 # Project State
@@ -22,12 +22,12 @@ See: .planning/PROJECT.md (updated 2026-03-19)
 
 ## Current Position
 
-Phase: 6 of 7 (Signing Flow) — Plan 4 complete
+Phase: 6 of 7 (Signing Flow) — Plan 5 complete (PHASE COMPLETE)
-Plan: 06-04 (4 of 5 plans) — SignatureModal, atomic POST submission, SHA-256 hash, audit trail
+Plan: 06-05 (5 of 5 plans) — Post-signing confirmation page + client PDF download with 15-min token
-Status: SignatureModal with Draw/Type/Use Saved tabs (signature_pad + DPR scaling), POST /api/sign/[token] with atomic one-time-use claim, embedSignatureInPdf, pdfHash stored, document status=Signed, full LEGAL-01 audit trail, /sign/[token]/confirmed page — npm run build passes cleanly.
+Status: Confirmation page at /sign/[token]/confirmed shows success checkmark, document name, signed timestamp, and download button. GET /api/sign/[token]/download streams signedFilePath PDF authorized by short-lived download JWT (dt param). createDownloadToken/verifyDownloadToken added to token.ts. SigningPageClient uses router.push. npm run build passes cleanly.
-Last activity: 2026-03-20 — Phase 6 Plan 04: signature modal + submission route
+Last activity: 2026-03-20 — Phase 6 Plan 05: confirmation page + download route
 
-Progress: [█████████░] 91%
+Progress: [█████████░] 95%
 
 ## Performance Metrics
 
@@ -62,6 +62,7 @@ Progress: [█████████░] 91%
 | Phase 06-signing-flow P02 | 2 | 2 tasks | 4 files |
 | Phase 06-signing-flow P03 | 3 | 2 tasks | 6 files |
 | Phase 06-signing-flow P04 | 7 | 2 tasks | 4 files |
+| Phase 06-signing-flow P05 | 3 | 2 tasks | 4 files |
 
 ## Accumulated Context
 
@@ -133,6 +134,9 @@ Recent decisions affecting current work:
 - [Phase 06-signing-flow 06-04]: POST /api/sign/[token] atomic claim via Drizzle UPDATE...WHERE isNull(usedAt).returning() — 0 rows = 409, PDF never written on race condition
 - [Phase 06-signing-flow 06-04]: /sign/[token]/confirmed is static server component — token already used at this point, no re-validation needed
 - [Phase 06-signing-flow 06-04]: sendAgentNotificationEmail is fire-and-forget via .then().catch() — email failure must never prevent the signing confirmation from reaching the client
+- [Phase 06-signing-flow 06-05]: Download token uses purpose:'download' claim with same SIGNING_JWT_SECRET — no DB record needed for 15-min ephemeral download authorization
+- [Phase 06-signing-flow 06-05]: Buffer cast to Uint8Array for Response constructor BodyInit compatibility in Next.js 16 TypeScript strict mode
+- [Phase 06-signing-flow 06-05]: router.push replaces window.location.href for confirmed page navigation — SPA navigation consistent with Next.js App Router patterns
 
 ### Pending Todos
 
@@ -149,5 +153,5 @@ None yet.
 ## Session Continuity
 
 Last session: 2026-03-20
-Stopped at: Completed 06-04-PLAN.md — SignatureModal, POST submission route, confirmed page
+Stopped at: Completed 06-05-PLAN.md — confirmation page, client PDF download route, Phase 6 complete
 Resume file: None

.planning/phases/06-signing-flow/06-05-SUMMARY.md

@@ -0,0 +1,134 @@
+---
+phase: 06-signing-flow
+plan: "05"
+subsystem: ui, api
+tags: [jwt, pdf, signing, next.js, jose, download]
+
+# Dependency graph
+requires:
+  - phase: 06-04
+    provides: POST /api/sign/[token] returning ok:true + documents.signedFilePath populated
+  - phase: 06-01
+    provides: token.ts with createSigningToken/verifySigningToken and jose JWT utilities
+
+provides:
+  - Confirmation page at /sign/[token]/confirmed — success checkmark, document name, signed timestamp, download button
+  - GET /api/sign/[token]/download — streams signedFilePath PDF using 15-min download JWT (dt query param)
+  - createDownloadToken / verifyDownloadToken in token.ts — short-lived download-only JWTs (no DB record)
+  - router.push navigation to confirmed page after successful POST submit
+
+affects:
+  - 07-phase (any future phase referencing signing completion flow)
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - Short-lived single-purpose JWT (purpose:'download') for client file download authorization, no DB row needed
+    - Server-side download token generation at page render time passed as query param
+    - Uint8Array cast for Buffer -> Response BodyInit compatibility in Next.js 16
+
+key-files:
+  created:
+    - teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts
+    - teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx (replaced placeholder)
+  modified:
+    - teressa-copeland-homes/src/lib/signing/token.ts
+    - teressa-copeland-homes/src/app/sign/[token]/_components/SigningPageClient.tsx
+
+key-decisions:
+  - "Download token uses purpose:'download' claim — same SIGNING_JWT_SECRET but separate purpose discriminator, no DB storage needed for 15-min TTL"
+  - "Buffer cast to Uint8Array for Response constructor BodyInit type compatibility (Next.js 16 / TypeScript strict)"
+  - "router.push replaces window.location.href for confirmed redirect — SPA navigation, consistent with Next.js patterns"
+  - "Download token generated server-side at confirmed page render; valid 15min from page load"
+
+patterns-established:
+  - "Short-lived download JWT pattern: SignJWT({ documentId, purpose: 'download' }) + 15m expiry, no DB row needed for ephemeral download auth"
+  - "Buffer -> Uint8Array cast for Response BodyInit in Next.js 16 API routes"
+
+requirements-completed:
+  - SIGN-06
+
+# Metrics
+duration: 3min
+completed: 2026-03-20
+---
+
+# Phase 06 Plan 05: Post-Signing Confirmation + Client PDF Download Summary
+
+**Post-signing confirmation page with document name, signed timestamp, and 15-min download token; GET /api/sign/[token]/download streams signedFilePath PDF authorized by short-lived download JWT**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-03-20T17:40:19Z
+- **Completed:** 2026-03-20T17:42:56Z
+- **Tasks:** 2
+- **Files modified:** 4
+
+## Accomplishments
+- Extended `token.ts` with `createDownloadToken` / `verifyDownloadToken` using `purpose:'download'` claim and 15-min TTL (no DB row)
+- Created `GET /api/sign/[token]/download` route: validates `dt` query param JWT, path traversal guard, streams `signedFilePath` as `application/pdf` with `Content-Disposition: attachment`
+- Replaced static placeholder `confirmed/page.tsx` with full server component: verifies signing token, fetches document name + signed timestamp, generates download token, renders success UX per locked design decisions
+- Updated `SigningPageClient.tsx` to use `router.push` (via `useRouter`) instead of `window.location.href` for confirmed page navigation
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Download token utilities + download API route** - `a276da0` (feat)
+2. **Task 2: Confirmation page + redirect from signing client** - `4cdd9ee` (feat)
+
+**Plan metadata:** (docs commit — pending final step)
+
+## Files Created/Modified
+- `teressa-copeland-homes/src/lib/signing/token.ts` - Added `createDownloadToken` and `verifyDownloadToken` exports
+- `teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts` - New: GET download handler with JWT validation + PDF streaming
+- `teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx` - Replaced static placeholder with full server component (doc name, timestamp, download button)
+- `teressa-copeland-homes/src/app/sign/[token]/_components/SigningPageClient.tsx` - Switched `window.location.href` to `router.push` for confirmed navigation
+
+## Decisions Made
+- Download token uses same `SIGNING_JWT_SECRET` but `purpose:'download'` discriminates from signing tokens — no DB record needed for 15-min ephemeral download
+- `Buffer` cast to `Uint8Array` for `Response` constructor compatibility in Next.js 16 TypeScript strict mode
+- `router.push` preferred over `window.location.href` for SPA navigation consistency with Next.js App Router
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] Fixed Buffer type incompatibility with Response BodyInit**
+- **Found during:** Task 1 (download API route)
+- **Issue:** `new Response(fileBuffer, ...)` failed TypeScript type check — `Buffer<ArrayBufferLike>` is not assignable to `BodyInit | null | undefined` in Next.js 16 strict mode
+- **Fix:** Cast `fileBuffer` as `new Uint8Array(fileBuffer)` before passing to `Response` constructor
+- **Files modified:** `teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts`
+- **Verification:** `npm run build` passes cleanly
+- **Committed in:** a276da0 (Task 1 commit)
+
+---
+
+**Total deviations:** 1 auto-fixed (1 type/bug fix)
+**Impact on plan:** Auto-fix necessary for build correctness. No scope creep.
+
+## Issues Encountered
+- Next.js 16 TypeScript strict mode rejects `Buffer` as `Response` body — required `Uint8Array` cast (type compatibility, not runtime behavior change).
+
+## User Setup Required
+None — no external service configuration required.
+
+## Next Phase Readiness
+- Complete e-signing ceremony is end-to-end: send link -> view PDF -> sign all fields -> submit -> confirmation page -> download signed PDF
+- SIGN-06 requirement fulfilled: confirmation page with checkmark, document name, timestamp, download button
+- Phase 6 (signing flow) is fully complete — all 5 plans executed
+- Ready for Phase 7 or production deployment when DNS/email is configured
+
+---
+*Phase: 06-signing-flow*
+*Completed: 2026-03-20*
+
+## Self-Check: PASSED
+
+- FOUND: teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx
+- FOUND: teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts
+- FOUND: .planning/phases/06-signing-flow/06-05-SUMMARY.md
+- FOUND commit: a276da0 (Task 1)
+- FOUND commit: 4cdd9ee (Task 2)