feat: add deterministic content extractor selector engine with F1 consensus

specs/004-deterministic-content-selection/checklists/requirements.md

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+# Specification Quality Checklist: Deterministic Content Selection
+
+**Purpose**: Validate specification completeness and quality before proceeding to planning  
+**Created**: 2026-08-20  
+**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 requirements are derived directly from PRD `docs/prd_deterministic_content_selection.md`.
+- No ambiguity remains; all edge cases and tie-breaking hierarchies are fully specified.
+- Ready for `/speckit-plan`.