parser: detect bold-as-heading + collapse letter-spacing (fixes filing parse)

pkg/ingest/ingest.go

@@ -359,11 +359,11 @@ func (p *Pipeline) summaryFor(ctx context.Context, s db.Section, childLines []st
 	resp, err := p.LLM.Complete(ctx, llmgate.Request{
 		Model:       p.SummaryModel,
 		Temperature: 0.0,
-		MaxTokens:   200,
+		MaxTokens:   260,
 		Messages: []llmgate.Message{
 			{Role: llmgate.RoleSystem, Content: summarySystemPrompt(profile)},
 			{Role: llmgate.RoleUser, Content: fmt.Sprintf(
-				"Summarize this section titled %q in a single sentence (max 40 words):\n\n%s",
+				"Section titled %q.\n\n%s\n\nReturn a single sentence (≤ 60 words) that names this section's concrete topics, entities, identifiers, and key items so a retrieval engine can match it to user questions.",
 				cleanForLLM(s.Title), body)},
 		},
 	})
@@ -484,16 +484,21 @@ func isLikelyMojibakeTitle(s string) bool {
 }
 
 // summarySystemPrompt returns a domain-aware system prompt for the
-// summarization LLM based on the document's store profile. Domain framing
-// nudges the model toward the salient facts of that document class.
+// summarization LLM based on the document's store profile. Summaries are
+// optimized for RETRIEVAL: a downstream retrieval engine, given only the
+// summary, should be able to tell whether the section answers a specific
+// question. So we ask the model to name the concrete topics, entities,
+// identifiers, and key items the section covers — not just describe it
+// generically.
 func summarySystemPrompt(profile string) string {
+	const retrievalRule = "Write so a downstream retrieval engine, reading only your summary, can tell whether this section answers a specific user question. Name the section's concrete topics — entities, identifiers, table contents, named items, key numbers — not just a generic description. One factual sentence, ≤ 60 words, no preamble, no quotes."
 	switch strings.ToLower(strings.TrimSpace(profile)) {
 	case "research":
-		return "You summarize sections of academic research papers. In one factual sentence capture the key claim, method, dataset, or result of the section. No preamble, no quotes, no citations."
+		return "You summarize sections of academic research papers. Capture the key claim, method, dataset, or result. " + retrievalRule
 	case "medical":
-		return "You summarize sections of clinical and medical documents. In one factual sentence capture the key finding, recommendation, dosage, definition, or guideline of the section. No preamble, no quotes."
+		return "You summarize sections of clinical and medical documents. Capture the key finding, recommendation, dosage, drug name, definition, or guideline. " + retrievalRule
 	default:
-		return "You write short, factual section summaries. One sentence, no preamble, no quotes."
+		return "You summarize sections of business, legal, and financial documents (filings, reports, contracts). " + retrievalRule
 	}
 }
 

pkg/parser/chunk_test.go

@@ -0,0 +1,92 @@
+package parser
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestChunkOversizedLeavesSplits(t *testing.T) {
+	// 12 words per "sentence", 5 sentences ~ 60-65 words, ~360 chars; we want
+	// >2400 chars so build it from a longer paragraph + a colon-terminated header.
+	header := "Securities registered pursuant to Section 12(b) of the Act: "
+	long := strings.Repeat("alpha beta gamma delta epsilon zeta eta theta iota kappa lambda mu ", 60)
+	content := header + long
+	if len(content) <= leafChunkThreshold {
+		t.Fatalf("test setup: content must exceed threshold; got %d", len(content))
+	}
+	in := []Section{{Level: 1, Title: "3M COMPANY", Content: content}}
+
+	out := chunkOversizedLeaves(in)
+	if len(out) != 1 {
+		t.Fatalf("expected 1 top-level section, got %d", len(out))
+	}
+	parent := out[0]
+	if parent.Title != "3M COMPANY" {
+		t.Errorf("parent title should be preserved, got %q", parent.Title)
+	}
+	if parent.Content != "" {
+		t.Errorf("parent content should be cleared after splitting, got %d chars", len(parent.Content))
+	}
+	if len(parent.Children) < 2 {
+		t.Fatalf("expected multiple chunks, got %d", len(parent.Children))
+	}
+	// First chunk's title should use the colon-terminated header.
+	if !strings.HasPrefix(parent.Children[0].Title, "Securities registered pursuant to Section 12(b)") {
+		t.Errorf("first chunk title should come from the colon header, got %q", parent.Children[0].Title)
+	}
+	// Every chunk's content should be non-empty and well below the original.
+	for i, c := range parent.Children {
+		if c.Content == "" {
+			t.Errorf("chunk %d has empty content", i)
+		}
+		if len(c.Content) > leafChunkTarget*2 {
+			t.Errorf("chunk %d larger than expected: %d chars", i, len(c.Content))
+		}
+	}
+}
+
+func TestChunkOversizedLeavesLeavesSmallSectionsAlone(t *testing.T) {
+	in := []Section{
+		{Level: 1, Title: "Intro", Content: strings.Repeat("a b c d e f ", 50)},  // ~600 chars
+		{Level: 1, Title: "Methods", Content: strings.Repeat("x y z ", 200)},      // ~1200 chars
+	}
+	out := chunkOversizedLeaves(in)
+	if len(out) != 2 {
+		t.Fatalf("expected 2 sections preserved, got %d", len(out))
+	}
+	for i, s := range out {
+		if len(s.Children) != 0 {
+			t.Errorf("section %d was unexpectedly split into %d children", i, len(s.Children))
+		}
+	}
+}
+
+func TestChunkOversizedLeavesRecursesIntoInternals(t *testing.T) {
+	bigLeaf := Section{Level: 2, Title: "Detail", Content: strings.Repeat("the quick brown fox jumps over the lazy dog ", 100)}
+	parent := Section{Level: 1, Title: "Parent", Children: []Section{bigLeaf}}
+	out := chunkOversizedLeaves([]Section{parent})
+	if len(out) != 1 || len(out[0].Children) == 0 {
+		t.Fatalf("parent should be retained with chunked children, got %+v", out)
+	}
+	leaf := out[0].Children[0]
+	if leaf.Title != "Detail" {
+		t.Errorf("inner leaf title should be preserved, got %q", leaf.Title)
+	}
+	if len(leaf.Children) < 2 {
+		t.Errorf("inner leaf should have been chunked, has %d children", len(leaf.Children))
+	}
+}
+
+func TestDeriveChunkTitleColonHeader(t *testing.T) {
+	got := deriveChunkTitle("Securities registered pursuant to Section 12(b) of the Act: Title of each class ...", "fallback")
+	want := "Securities registered pursuant to Section 12(b) of the Act"
+	if got != want {
+		t.Errorf("colon-header title: got %q want %q", got, want)
+	}
+}
+
+func TestDeriveChunkTitleFallback(t *testing.T) {
+	if got := deriveChunkTitle("", "fb"); got != "fb" {
+		t.Errorf("empty chunk should fall back, got %q", got)
+	}
+}