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docs: add implementation readiness assessment report

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All 6 validation categories passed: 31/31 FRs covered, full UX
alignment, no critical issues. Project is ready for sprint planning.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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---
stepsCompleted: ['step-01-document-discovery', 'step-02-prd-analysis', 'step-03-epic-coverage-validation', 'step-04-ux-alignment', 'step-05-epic-quality-review', 'step-06-final-assessment']
inputDocuments:
- '_bmad-output/planning-artifacts/prd.md'
- '_bmad-output/planning-artifacts/architecture.md'
- '_bmad-output/planning-artifacts/epics.md'
- '_bmad-output/planning-artifacts/ux-design-specification.md'
---
# Implementation Readiness Assessment Report
**Date:** 2026-04-13
**Project:** try-bmad
## Document Inventory
| Document Type | File | Format |
|---------------|------|--------|
| PRD | prd.md | Whole |
| Architecture | architecture.md | Whole |
| Epics & Stories | epics.md | Whole |
| UX Design | ux-design-specification.md | Whole |
**Issues:** None — all 4 required documents found, no duplicates.
## PRD Analysis
### Functional Requirements
FR1: Render a 4x4 grid with empty cell placeholders
FR2: Spawn 2 random tiles on game initialization
FR3: Spawn 1 random tile after each valid move (90/10 probability: value 2 vs value 4)
FR4: Slide all movable tiles in the input direction (up, down, left, right)
FR5: Merge identical adjacent tiles using leading-edge merge order
FR6: Enforce once-per-move merge rule (tile merges at most once per move)
FR7: Track and display current score, incrementing by merged tile values
FR8: Track and display best score, updating when current exceeds it
FR9: Persist best score across sessions using localStorage
FR10: Detect game over condition (no valid moves remaining on full board)
FR11: Detect win condition (2048 tile created) and display win overlay (trigger once)
FR12: Provide "Keep playing" mode after winning
FR13: Provide New Game button (no confirmation dialog)
FR14: Accept keyboard input: arrow keys
FR15: Accept keyboard input: WASD keys
FR16: Accept keyboard input: Vim hjkl keys
FR17: Accept touch/swipe input (10px threshold, dominant-axis detection)
FR18: Display 12-tier tile color system matching original 2048
FR19: Animate tile sliding (100ms CSS transition, ease-in-out)
FR20: Animate new tile spawn (200ms pop, scale 0 to 1.0)
FR21: Animate tile merge (200ms bounce, scale 1.0 to 1.2 to 1.0)
FR22: Animate score addition (+N float, 600ms, rises and fades)
FR23: Persist full game state to localStorage after every valid move
FR24: Restore game state from localStorage on page load
FR25: Display game over overlay with "Try again" button
FR26: Display win overlay with "Keep going" and "New Game" buttons
FR27: Fade in overlays with 800ms opacity transition
FR28: Render responsive layout (500px desktop, 280px mobile at 520px breakpoint)
FR29: Display tile glow effect on values 128+
FR30: Apply dynamic font sizing by digit count (55/45/35/25/15px)
FR31: Deploy as static site to GitHub Pages via GitHub Actions
**Total FRs: 31**
### Non-Functional Requirements
NFR1: Initial page load under 1 second
NFR2: All CSS animations at 60fps
NFR3: Input-to-visual-response latency under 16ms
NFR4: Production bundle size under 50KB gzipped
NFR5: Support modern evergreen browsers (Chrome, Firefox, Safari, Edge)
NFR6: WCAG AA accessibility compliance
NFR7: Respect prefers-reduced-motion media query
NFR8: Fully client-side — no backend, no server communication
NFR9: Game logic as pure JavaScript functions, testable independently
**Total NFRs: 9**
### Additional Requirements
- Starter template: create-vite + Svelte + Tailwind CSS v4 + Vitest
- Project structure: src/lib/ (pure JS), src/components/ (Svelte)
- Immutable state returns from game logic
- Props-down architecture (no Svelte stores)
- localStorage schema: gameState + bestScore keys
- CSS transitions only (no JS setTimeout for animations)
- Constants module for shared values
- Clear Sans font with fallback chain
### PRD Completeness Assessment
**Status: COMPLETE** — PRD covers executive summary, project classification, success criteria (user/technical/measurable), product scope (MVP + 3 phases), 3 user journeys, web app requirements, responsive design specs, performance targets, and risk mitigation. No gaps identified.
## Epic Coverage Validation
### Coverage Matrix
| FR | PRD Requirement | Epic Coverage | Status |
|----|----------------|---------------|--------|
| FR1 | 4x4 grid rendering | Epic 1, Story 1.3 | Covered |
| FR2 | Spawn 2 tiles at start | Epic 1, Story 1.2 | Covered |
| FR3 | Spawn 1 tile per move (90/10) | Epic 1, Story 1.2 | Covered |
| FR4 | Slide tiles in 4 directions | Epic 1, Story 1.2 | Covered |
| FR5 | Leading-edge merge order | Epic 1, Story 1.2 | Covered |
| FR6 | Once-per-move merge rule | Epic 1, Story 1.2 | Covered |
| FR7 | Current score tracking | Epic 1, Story 1.4 | Covered |
| FR8 | Best score display | Epic 2, Story 2.1 | Covered |
| FR9 | Best score persistence | Epic 2, Story 2.2 | Covered |
| FR10 | Game over detection | Epic 1, Stories 1.2 + 1.6 | Covered |
| FR11 | Win detection + overlay | Epic 1, Stories 1.2 + 1.6 | Covered |
| FR12 | Keep playing mode | Epic 2, Story 2.3 | Covered |
| FR13 | New Game button | Epic 1, Story 1.4 | Covered |
| FR14 | Arrow key input | Epic 1, Story 1.5 | Covered |
| FR15 | WASD key input | Epic 4, Story 4.1 | Covered |
| FR16 | Vim hjkl key input | Epic 4, Story 4.1 | Covered |
| FR17 | Touch/swipe input | Epic 4, Story 4.2 | Covered |
| FR18 | 12-tier tile colors | Epic 1, Story 1.3 | Covered |
| FR19 | Slide animation (100ms) | Epic 3, Story 3.1 | Covered |
| FR20 | Spawn pop animation (200ms) | Epic 3, Story 3.2 | Covered |
| FR21 | Merge bounce animation (200ms) | Epic 3, Story 3.3 | Covered |
| FR22 | Score float animation (600ms) | Epic 3, Story 3.4 | Covered |
| FR23 | Game state persistence | Epic 2, Story 2.2 | Covered |
| FR24 | Game state restore | Epic 2, Story 2.2 | Covered |
| FR25 | Game over overlay | Epic 1, Story 1.6 | Covered |
| FR26 | Win overlay | Epic 1, Story 1.6 | Covered |
| FR27 | Overlay fade animation | Epic 3, Story 3.5 | Covered |
| FR28 | Responsive layout | Epic 4, Story 4.3 | Covered |
| FR29 | Tile glow (128+) | Epic 5, Story 5.1 | Covered |
| FR30 | Dynamic font sizing | Epic 5, Story 5.2 | Covered |
| FR31 | GitHub Pages deployment | Epic 5, Story 5.3 | Covered |
### Missing Requirements
None — all FRs have traceable implementation paths.
### Coverage Statistics
- Total PRD FRs: 31
- FRs covered in epics: 31
- Coverage percentage: 100%
## UX Alignment Assessment
### UX Document Status
Found: `ux-design-specification.md` — comprehensive spec covering visual design, components, interactions, responsive design, and accessibility.
### UX ↔ PRD Alignment
- User journeys match across both documents
- Visual specs (colors, typography, animations) support all PRD requirements
- Accessibility requirements (WCAG AA, reduced motion) aligned
- **No misalignments found**
### UX ↔ Architecture Alignment
- 5 Svelte components match UX component strategy exactly
- CSS transition approach supports UX animation timing specs
- Responsive breakpoint (520px) consistent across both
- Props-down pattern supports UX state communication
- **No architectural gaps for UX requirements**
### UX ↔ Epics Alignment
- 20 UX Design Requirements (UX-DR1 through UX-DR20) extracted and referenced in story acceptance criteria
- Accessibility, visual design, responsive, and animation UX-DRs distributed across all 5 epics
- **No UX requirements left uncovered**
### Warnings
None — UX document is comprehensive and fully aligned with PRD and Architecture.
## Epic Quality Review
### Epic Structure Validation
All 5 epics deliver user value and maintain independence:
- Epic 1: Standalone complete game
- Epic 2: Adds persistence (uses Epic 1 only)
- Epic 3: Adds animations (uses Epic 1+2)
- Epic 4: Adds mobile/input (uses Epic 1+2+3)
- Epic 5: Adds polish + deploy (uses all previous)
No epic requires a future epic to function.
### Story Dependency Analysis
All 20 stories follow forward-only dependencies within their epics. No story references features from future stories. Stories in Epics 3-5 are largely independent of each other within their epic.
### Acceptance Criteria Quality
All stories use Given/When/Then BDD format with specific, testable criteria. Edge cases covered include: corrupted localStorage, invalid moves, reduced motion preference, accidental swipes, diagonal touches, full board scenarios.
### Starter Template Compliance
Story 1.1 correctly implements Architecture's specified starter template (create-vite + Svelte + Tailwind + Vitest) as the first implementation story.
### Violations Found
- **Critical:** 0
- **Major:** 0
- **Minor:** 1 — Story 1.1 (scaffold) is technical but justified by Architecture's greenfield starter template requirement
### Recommendations
None — epic and story quality meets all best practice standards.
## Summary and Recommendations
### Overall Readiness Status
**READY**
### Critical Issues Requiring Immediate Action
None.
### Assessment Summary
| Category | Result |
|----------|--------|
| Documents | 4/4 found, no duplicates |
| FR Coverage | 31/31 (100%) |
| NFR Coverage | 9/9 documented |
| UX Alignment | Fully aligned across PRD, Architecture, and Epics |
| Epic Quality | 0 critical, 0 major, 1 minor |
| Story Quality | All 20 stories have testable Given/When/Then ACs |
| Dependencies | No forward dependencies, all epics independent |
### Recommended Next Steps
1. Proceed to Sprint Planning to sequence the 20 stories for implementation
2. Begin with Epic 1, Story 1.1 (Project Scaffold) as the foundation
3. Consider running stories 1.1 and 1.2 in the first sprint as they establish the project foundation and core game logic
### Final Note
This assessment identified 0 critical issues across 6 validation categories. All planning artifacts (PRD, Architecture, UX Design, Epics & Stories) are complete, aligned, and ready for implementation. The project can proceed directly to Sprint Planning.