fix(assets): bound every link of the filter chain, and cover the backstop

The two findings of the 18.09 PM checkpoint of `0f308c1`. Red tests landed
first in `3b587ea`; this is what turns them green.

BLOCKER -- `_check_inflated` read `filters[0]`, measured that one link and
returned, which is not a bound: a PDF decodes a stream through a LIST of
filters. Measured in paired subprocesses from two pinned trees, idle machine:

  [/FlateDecode]        400 MB  408 516 B   59 232 256 ->    62 017 536 B
  [/FlateDecode x2]     400 MB    1 636 B  886 554 624 ->    52 367 360 B
  [/FlateDecode x3]     400 MB    1 070 B  889 393 152 ->    61 390 848 B
  [/FlateDecode x2]     1,2 GB    2 927 B  2 567 204 864 ->  60 403 712 B

542 000x the file at two links, and the picture WAS refused at the end -- by
`check_payload` after `get_data()`, once the memory was spent. The single-link
row is the control and does not move. It also left the 16 corpus objects behind
an `[/ASCII85Decode /FlateDecode]` chain unmeasured, since `filters[0]` is not
`FlateDecode` there.

`_check_stream_cost` walks every link. THREE CLASSES and no fourth
(`extract.bounded_pdf_filters`, pinned by a test): `FlateDecode` MEASURED, a
link with another expanding link behind it inflated under the same bound and
handed on; `ASCII85Decode`/`ASCIIHexDecode` bounded by their own input because
they SHRINK; `DCTDecode`/`JPXDecode`/`JBIG2Decode` PASS THROUGH. Everything
else -- `LZWDecode`, `RunLengthDecode`, `CCITTFaxDecode`, `/Crypt`, anything
written later -- is refused UNREAD with a new code `asset_pdf_unbounded`,
decided before the FIRST link is decoded so a document cannot make the run pay
for the links in front of the one we cannot bound. An encrypted stream is
deciphered and then measured, where `stream.decipher is not None` used to
return unmeasured; 0 of 5 142 objects here are in an encrypted document, which
is why nothing caught it.

NOT ONE PICTURE CHANGES HANDS, AND IT IS MEASURED BY NAME. Every PDF on this
machine -- 78 documents, K2 in both trinn1 and trinn2, the shipped fixtures and
R761 -- run through `_pdf_images` page by page from both pinned trees:

  images carried          9 356 -> 9 356
  documents losing one              0 of 78
  documents gaining one             0 of 78
  asset_pdf_unsupported     322 -> 314
  asset_pdf_unbounded         0 -> 8

The 8 are the 4 `CCITTFaxDecode` stencil masks (`/ImageMask true`,
`/BitsPerComponent 1`), counted twice because trinn1 and trinn2 hold the same
document. They were refused before and are refused now, one step earlier and
under a code that says why.

MAJOR -- `check_payload(len(data))` after `get_data()` is the counted refusal
four documentation surfaces point at, and deleting exactly that line passed all
2 132 tests. It is reachable through a stream pdfminer has ALREADY decoded
(`decode()` sets `rawdata` to `None`), which is now the ONLY case outside the
bound and has a test.

Eight mutations, one line each, every one DEAD, with the unmutated tree run
first as the control: first-link-only, loop dropped, inequality reversed,
encrypted skipped, backstop deleted, unknown filter passed through,
intermediate link not carried forward, whole check removed.

`tools/okf_accounting_gate.py` gains one line, the new code in
`REJECTION_CODES` -- what a rejection code requires and nothing more. Gate
unchanged: exit 1, GATE RED rows 2, 3, 6. Version stays 0.10.1, untagged.

Suite after `git add` against a clean tree: `uv run pytest -q` ->
2152 passed, 1 skipped (226 s). ruff, ruff format --check, mypy --strict clean.

Report: docs/2026-09-18-filterkjeden-og-backstoppen.md

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/test_error_codes.py

@@ -750,6 +750,29 @@ def test_asset_too_large() -> None:
     assert excinfo.value.code == "asset_too_large"
 
 
+def test_asset_pdf_unbounded() -> None:
+    """A filter whose output cannot be measured before it is produced.
+
+    Its own code because it says something different from `asset_too_large`:
+    that one reports a measurement that came out over the bound, this one
+    reports that no measurement was possible, so the picture was refused
+    unread. Reached through the real PDF path rather than a helper, because
+    the decision is which FILTER the stream declares.
+    """
+    from llm_ingestion_okf.extract import extract_document
+
+    pytest.importorskip("pdfplumber")
+    sys.path.insert(0, str(Path(__file__).parent))
+    from test_asset_limits import _bomb
+
+    extracted = extract_document(
+        "lzw.pdf", _bomb(4, payload=b"\xff" * 512, filters="/LZWDecode"), assets=True
+    )
+    assert [item.code for item in extracted.rejected] == ["asset_pdf_unbounded"]
+    registry = ExtractionError.__doc__ or ""
+    assert "`asset_pdf_unbounded`" in registry
+
+
 def test_asset_size_invalid() -> None:
     """A declared size that is not a size. Its own code because it says
     something different about the document than `asset_too_large` does."""