Use UUID-based URNs for page and chunk IDs (#703)

Page and chunk document IDs were deterministic ({doc_id}/p{num},
{doc_id}/p{num}/c{num}), causing "Document already exists" errors
when reprocessing documents through different flows. Content may
differ between runs due to different parameters or extractors, so
deterministic IDs are incorrect.

Pages now use urn:page:{uuid}, chunks use
urn:chunk:{uuid}. Parent- child relationships are tracked via
librarian metadata and provenance triples.

Also brings Mistral OCR and Tesseract OCR decoders up to parity
with the PDF decoder: librarian fetch/save support, per-page
output with unique IDs, and provenance triple emission. Fixes
Mistral OCR bug where only the first 5 pages were processed.

trustgraph-flow/trustgraph/decoding/pdf/pdf_decoder.py

@@ -23,7 +23,7 @@ from ... base import FlowProcessor, ConsumerSpec, ProducerSpec
 from ... base import Consumer, Producer, ConsumerMetrics, ProducerMetrics
 
 from ... provenance import (
-    document_uri, page_uri, derived_entity_triples,
+    document_uri, page_uri as make_page_uri, derived_entity_triples,
     set_graph, GRAPH_SOURCE,
 )
 
@@ -272,8 +272,9 @@ class Processor(FlowProcessor):
 
                 logger.debug(f"Processing page {page_num}")
 
-                # Generate page document ID
-                page_doc_id = f"{source_doc_id}/p{page_num}"
+                # Generate unique page ID
+                pg_uri = make_page_uri()
+                page_doc_id = pg_uri
                 page_content = page.page_content.encode("utf-8")
 
                 # Save page as child document in librarian
@@ -288,7 +289,6 @@ class Processor(FlowProcessor):
 
                 # Emit provenance triples (stored in source graph for separation from core knowledge)
                 doc_uri = document_uri(source_doc_id)
-                pg_uri = page_uri(source_doc_id, page_num)
 
                 prov_triples = derived_entity_triples(
                     entity_uri=pg_uri,