fix(segmentation): hash the extracted text and let the plan key fire

tests/test_segmented_rebuild.py

@@ -41,7 +41,12 @@ import pytest
 from llm_ingestion_okf.errors import SegmentationError
 from llm_ingestion_okf.inbox import GateDecision, process_inbox
 from llm_ingestion_okf.profiles import SEGMENTED_V1
-from llm_ingestion_okf.segmentation import SegmentationPlan, parse_segmentation_plan
+from llm_ingestion_okf.extract import extract_text
+from llm_ingestion_okf.segmentation import (
+    SegmentationPlan,
+    observed_extractor_version,
+    parse_segmentation_plan,
+)
 
 # THREE distinct call-level values. None of them may reach a plan-covered
 # concept, and the test is worthless if they are all the same.
@@ -80,6 +85,10 @@ def drop(inbox: Path, name: str = "n500.md", text: str = DOCUMENT) -> Path:
     return path
 
 
+def _extracted_text_sha256(source_bytes: bytes, filename: str = "n500.md") -> str:
+    return hashlib.sha256(extract_text(filename, source_bytes).encode("utf-8")).hexdigest()
+
+
 def build_plan(
     source_bytes: bytes,
     entries: tuple[tuple[str, str, str | None], ...],
@@ -88,8 +97,12 @@ def build_plan(
     payload: dict[str, Any] = {
         "version": "1",
         "source_sha256": hashlib.sha256(source_bytes).hexdigest(),
+        # The hash of the CANONICAL EXTRACTED text, which is what the spans
+        # index. Equal to the source hash on a `.md` passthrough and computed
+        # rather than copied, so the fixture keeps saying which one it means.
+        "text_sha256": _extracted_text_sha256(source_bytes),
         "extractor_id": "md",
-        "extractor_version": "1.0.0",
+        "extractor_version": observed_extractor_version("md"),
         "adjudicated_at": "2026-08-30T08:00:00Z",
         "entries": [
             {