feat(classifier): add multilingual ECP inherence classifier POC

specs/001-multilingual-entity-classifier/checklists/requirements.md

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+# Specification Quality Checklist: Multilingual NLP Entity Inherence Classifier
+
+**Purpose**: Validate specification completeness and quality before proceeding to planning
+**Created**: 2026-08-19
+**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
+
+- Initial requirements documented from user audio brief and refined with POC constraints.
+- ECP defined as Entity Context Profile with materialized JSON snapshots.
+- Tier 1 (deterministic rules) defined as mandatory core; Tier 2 (embeddings) and Tier 3 (LLM) defined as optional/configurable (LLM off by default, no API key required).
+- Decision rules explicitly codified for all 4 categories and derived `is_inherent` boolean.
+- Success criteria scoped to a controlled 24-case POC benchmark suite (6 languages × 4 decision types).
+- Structured error codes defined (`invalid_ecp_json`, `invalid_markdown`, `unsupported_language`, `empty_content`, `missing_required_field`).
+- Explicit out-of-scope declarations enforced (No REST API, No package publishing, No queues/workers, No runtime DB/Neo4j).