Implement the 021-bestiary-statblock feature that adds a searchable D&D 2024 Monster Manual creature library with inline autocomplete suggestions, full stat block display in a fixed side panel, auto-numbering of duplicate creature names, HP/AC pre-fill from bestiary data, and automatic stat block display on turn change for wide viewports

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

specs/021-bestiary-statblock/checklists/requirements.md

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+# Specification Quality Checklist: Bestiary Search & Stat Block Display
+
+**Purpose**: Validate specification completeness and quality before proceeding to planning
+**Created**: 2026-03-06
+**Feature**: [spec.md](../spec.md)
+
+## Content Quality
+
+- [x] No implementation details (languages, frameworks, APIs)
+- [x] Focused on user value and business needs
+- [x] Written for non-technical stakeholders
+- [x] All mandatory sections completed
+
+## Requirement Completeness
+
+- [x] No [NEEDS CLARIFICATION] markers remain
+- [x] Requirements are testable and unambiguous
+- [x] Success criteria are measurable
+- [x] Success criteria are technology-agnostic (no implementation details)
+- [x] All acceptance scenarios are defined
+- [x] Edge cases are identified
+- [x] Scope is clearly bounded
+- [x] Dependencies and assumptions identified
+
+## Feature Readiness
+
+- [x] All functional requirements have clear acceptance criteria
+- [x] User scenarios cover primary flows
+- [x] Feature meets measurable outcomes defined in Success Criteria
+- [x] No implementation details leak into specification
+
+## Notes
+
+- All items pass validation.
+- Assumptions made: auto-numbering renames first instance to "Goblin 1" when a second is added (documented in edge cases). Minimum 2 characters before suggestions appear (documented in US3). Source tag disambiguation for future multi-source support (documented in edge cases).