Harden layout block fixture diagnostics

docs/execution-status.md

@@ -14,7 +14,7 @@ The committed implementation now includes:
 - A pinned Phase 1 PDFium profile in `docs/pdfium-profile.md` and `profiles/ethos-deterministic-v1.json`: `chromium/7881`, V8/XFA disabled, platform artifact hashes, runtime library hashes, and provenance are recorded.
 - Runtime checks that reject missing or mismatched PDFium versions, release artifacts, and extracted libraries with stable errors before dynamic loading.
 - `ethos doc parse` / `ethos fingerprint` PDF execution through a worker process with `max_parse_ms` timeout enforcement, stable error-envelope relay, diagnostics-gated worker stderr, and page-range validation/filtering.
-- Quantized page/span extraction at the backend boundary, plus a basic deterministic layout pass that assembles paragraph `text_block` elements and simple column reading order for the current born-digital fixtures. Fixture validation binds selected `fixture.json` expectations to committed extraction/layout goldens so current read-order cases fail closed on drift.
+- Quantized page/span extraction at the backend boundary, plus a basic deterministic layout pass that assembles paragraph `text_block` elements and simple column reading order for the current born-digital fixtures. Fixture validation binds selected `fixture.json` expectations to committed extraction/layout goldens so current read-order and element-type cases fail closed on drift.
 - Schema/example/profile validation is green through `schemas/validate_examples.py` using `jsonschema` draft 2020-12 validation, including the crop descriptor artifact contract plus referential-integrity and bbox sanity checks outside JSON Schema.
 - `ethos verify` now produces non-empty quote, value, presence, and table-cell verification checks over native Ethos document JSON and synthetic OpenDataLoader-style JSON through `--grounding opendataloader-json`; it also verifies quote/value/presence citations over pinned real OpenDataLoader 2.4.7 JSON, including grounded and ungrounded cases. Citation/config inputs are rejected when they drift outside the closed schemas. The public demo harness covers grounded, ungrounded, split-quote, not-found, stale-fingerprint, unsupported non-v1 claim, capability-limited, malformed-citation, malformed OpenDataLoader-style input, and summary-format reject paths.
 - Verification semantics are now trust-honest at alpha scope: quote containment is explicitly labeled, value/table-cell checks require normalized equality, fingerprint-pinned citations fail closed when source fingerprints are unavailable, and structured capability limits explain why a run is downgraded.
@@ -49,7 +49,7 @@ Milestone A has an accepted internal Gate Zero decision for roadmap control, so
 | PDFium Phase 1 profile | Landed: pinned profile, V8/XFA-disabled state, platform hashes, runtime library hashes, and provenance are recorded | Phase 2 project-maintained builds still block Public Beta |
 | PDFium loader/runtime checks | Landed: missing/mismatched version, artifact, and runtime library hashes fail deterministically | Release packaging and operator setup path still need hardening |
 | Real PDF backend | Landed for simple born-digital PDFs: page count, quantized spans, worker execution, timeout, page filtering, and fingerprint path exist | Wider corpus coverage, failure fixtures, memory-limit behavior, quirk log, and Gate Zero run are still missing |
-| Layout groundwork | Landed: basic paragraph text blocks, simple column reading order over quantized spans, and fixture metadata checks against committed extraction/layout goldens | Tables, headings, lists, rotation/quirk handling, and confidence policy remain future work |
+| Layout groundwork | Landed: basic paragraph text blocks, simple column reading order over quantized spans, and fixture metadata checks against committed extraction/layout goldens for current read-order and element-type expectations | Tables, headings, lists, rotation/quirk handling, and confidence policy remain future work |
 | Font policy groundwork | Partially landed: substitution table and profile policy are present; fixture output uses deterministic substitution IDs | Bundled fallback asset hashing and broader font/CID validation remain open |
 | Schema/example validation | Landed: schemas, examples, deterministic profile, referential integrity, and bbox sanity pass the `jsonschema` validation gate | Contract changes still require explicit versioning and compatibility review |
 | Trust-layer implementation | Landed: `ethos verify` quote/value/presence/table-cell checks, explicit quote-containment labeling, normalized equality for value/table-cell checks, stale and unverifiable fingerprint handling, unsupported claim reporting, structured capability limits, native Ethos JSON path, ODL-style adapter path with synthetic table/cell mapping, pinned real OpenDataLoader 2.4.7 grounded/ungrounded fixtures, foreign fixture manifest hash validation, crop-ref evidence plumbing, stable logical native crop refs, native crop descriptor artifacts, raw BGRA crop rendering in `ethos-pdf`, CLI PNG crop artifact production for bound native source PDFs, same-host rendered crop repeatability check, rendered-crop run comparison helper, strict citation/config input validation, citation input schema, split-quote fixture coverage, explicit unsupported non-v1 claim reporting, OpenDataLoader-style structure diagnostics for malformed bbox and unknown-page references, verify-alpha case inventory checks, and demo fixtures | Still needed: real OpenDataLoader table-cell grounding, additional adapter hardening against broader real output shapes, future claim-kind expansion outside the current v1 alpha policy, and a decision on whether cross-platform rendered crop artifact equality is worth pursuing after the current macOS/Linux bbox drift finding |

fixtures/README.md

@@ -43,6 +43,7 @@ expectations to those committed goldens:
 - `expected_pages`: exact `extraction.json` page count.
 - `expected_span_text`: exact `extraction.json` span text order.
 - `expected_elements`: exact `layout.json` element count.
+- `expected_element_types`: exact `layout.json` element type order.
 - `expected_text`: exact `layout.json` element text order. Use a string for a single
   layout element and a string array when reading order spans multiple elements.
 

fixtures/synthetic/hyphenated-line-break/fixture.json

@@ -10,5 +10,6 @@
     "two-line paragraph grouping",
     "Type1 base font text spans"
   ],
-  "expected_text": "hyphen ated"
+  "expected_text": "hyphen ated",
+  "expected_element_types": ["text_block"]
 }

fixtures/synthetic/ligature-fi-embedded-font/fixture.json

@@ -16,5 +16,6 @@
   "expected_spans": [
     { "text": "office", "char_start": 0, "char_end": 6 },
     { "text": "file", "char_start": 7, "char_end": 11 }
-  ]
+  ],
+  "expected_element_types": ["text_block"]
 }

fixtures/synthetic/rotation-90/fixture.json

@@ -11,5 +11,6 @@
     "Type1 base font text spans"
   ],
   "expected_text": "Rotate Ninety",
-  "expected_rotation": 90
+  "expected_rotation": 90,
+  "expected_element_types": ["text_block"]
 }

fixtures/synthetic/simple-text/fixture.json

@@ -11,5 +11,6 @@
     "PDFium char-box quantization",
     "canonical document assembly"
   ],
-  "expected_text": "Hello Ethos"
+  "expected_text": "Hello Ethos",
+  "expected_element_types": ["text_block"]
 }

fixtures/synthetic/two-columns/fixture.json

@@ -24,6 +24,7 @@
   ],
   "expected_pages": 1,
   "expected_elements": 2,
+  "expected_element_types": ["text_block", "text_block"],
   "exercises": [
     "two-column born-digital text extraction",
     "geometry-based column ordering",

fixtures/synthetic/two-lines/fixture.json

@@ -10,5 +10,6 @@
   "pages": 1,
   "expected_text": "First line Second line",
   "expected_pages": 1,
-  "expected_elements": 1
+  "expected_elements": 1,
+  "expected_element_types": ["text_block"]
 }

fixtures/validate_fixtures.py

@@ -278,6 +278,21 @@ def validate_expected_text(metadata, layout, ctx: str) -> None:
         fail(f"{ctx} expected_text must be a string or string array")
 
 
+def validate_expected_element_types(metadata, layout, ctx: str) -> None:
+    if "expected_element_types" not in metadata:
+        return
+    expected = metadata["expected_element_types"]
+    if not isinstance(expected, list) or not all(isinstance(item, str) for item in expected):
+        fail(f"{ctx} expected_element_types must be a string array")
+        return
+    elements = layout.get("elements") if isinstance(layout, dict) else None
+    if not isinstance(elements, list):
+        return
+    actual = [element.get("type") for element in elements]
+    if actual != expected:
+        fail(f"{ctx} expected_element_types must match layout element type order")
+
+
 def validate_expected_span_text(metadata, extraction, ctx: str) -> None:
     if "expected_span_text" not in metadata:
         return
@@ -309,6 +324,7 @@ def validate_stage_expectations(metadata_path: Path, metadata, extraction, layou
             f"{ctx} expected_elements",
         )
         validate_expected_text(metadata, layout, ctx)
+        validate_expected_element_types(metadata, layout, ctx)
 
 
 manifest = load_json(MANIFEST)