Implement Semantic Consolidator V0

- add deterministic canonicalization support for extraction items
- add facts-only semantic consolidation using local Ollama
- preserve source evidence and validate complete fact coverage
- add conservative merge rules and non-LLM tests
- record the first validated real-life consolidation benchmark
- document current scope, limitations and next evaluation step

docs/data-models.md

@@ -242,10 +242,35 @@ This object feeds the Canonical Meeting Knowledge representation.
 
 ---
 
-# Canonical Extraction Object
+# Canonicalized Extractions
 
-Planned deterministic intermediate object created from raw chunk extraction
-JSON.
+Implemented deterministic intermediate file created from raw chunk extraction
+JSON by Canonicalizer V1. This is not Canonical Meeting Knowledge.
+
+Top-level structure:
+
+```json
+{
+    "schema_version": "1",
+    "source_files": [],
+    "stats": {},
+    "items": []
+}
+```
+
+Each item contains at least:
+
+- item_id
+- category
+- text
+- evidence
+- source_file
+- source_index
+- original_value
+- source_references
+
+Action items also preserve deterministic fields such as `responsible` and
+`deadline` when present.
 
 Example:
 
@@ -264,16 +289,42 @@ Example:
 }
 ```
 
-The Deterministic Canonicalizer should create this kind of object without an
-LLM. It validates and normalizes raw extraction objects, assigns stable IDs and
-source references, normalizes category names and basic field structure,
-performs only safe deterministic cleanup, may group exact duplicates and must
-preserve all source evidence.
+Canonicalizer V1 creates this kind of object without an LLM. It validates and
+normalizes raw extraction objects, assigns stable IDs and source references,
+normalizes category names and basic field structure, performs only safe
+deterministic cleanup, may group exact duplicates and must preserve all source
+evidence.
 
 It must not perform uncertain semantic merging.
 
 ---
 
+# Semantic Fact Group
+
+Implemented by Semantic Consolidator V0.
+
+Example:
+
+```json
+{
+    "consolidated_id": "fact_group_0001",
+    "category": "fact",
+    "canonical_text": "...",
+    "source_item_ids": ["fact_0001"],
+    "source_references": [],
+    "evidence": [],
+    "merge_reason": "Singleton; no semantically equivalent fact found."
+}
+```
+
+Semantic Consolidator V0 only processes fact items. It merges semantically
+equivalent facts conservatively, preserves source references and evidence, and
+validates that every source fact appears exactly once. Non-fact categories are
+copied unchanged. It is not a summarizer, topic grouper, protocol renderer or
+Canonical Meeting Knowledge generator.
+
+---
+
 # Consolidated Topic
 
 Planned semantic object produced by the Semantic Consolidator.
@@ -294,10 +345,10 @@ Example:
 }
 ```
 
-The Semantic Consolidator may use the local LLM to merge semantically
-equivalent statements, group content by topic, preserve evidence from all
-contributing chunks, mark contradictions and uncertainty and separate durable
-information from transient discussion.
+Future Semantic Consolidator versions may use the local LLM to merge
+semantically equivalent statements beyond facts, group content by topic,
+preserve evidence from all contributing chunks, mark contradictions and
+uncertainty and separate durable information from transient discussion.
 
 It produces Canonical Meeting Knowledge. It does not directly write a protocol.