setup.lab() drops every metadata reader's file parameter and installs no syncgraph; port ndi.setup.sync and vendor sync_rules/ #94

Part of #90 (PR #61 catch-up). This is item M4, and it is a live defect, not just a parity gap — verified against main today.

The defect

src/ndi/setup/lab.py:163-178 builds the daq/daqmetadatareader document with exactly one field:

mr_doc = session.newdocument(
    "daq/daqmetadatareader",
    **{
        "base.name": name,
        "daqmetadatareader.ndi_daqmetadatareader_class": mr_class,
    },
)

No file parameter is set. And MetadataReaderFileParameters — which appears in 10 bundled lab configs — is read by zero lines of Python in src/:

$ grep -rn "MetadataReaderFileParameters" src/ --include=*.py
(no matches)

So every lab configured through setup.lab() gets a metadata reader that matches no files and therefore reads no stimulus metadata. Affected configs:

Second half of the same defect: lab.py:165-169 collapses a multi-entry reader spec with metadata_reader_class[0], building one reader where MATLAB (+setup/lab.m) builds one per file-parameter entry. dbkatzlab/narendra_intan.json declares three .tsv metadata files and gets one reader with none of them — 2 of 3 files silently lost even once the first bug is fixed.

Third: setup.lab() installs no sync rules at all, so every lab comes up with an empty syncgraph. MATLAB installs a default filematch(2) syncrule. This is a pre-existing divergence, not a regression.

What it would take

1. Read MetadataReaderFileParameters in lab.py and set it on the daqmetadatareader document, in the same MATLAB cell-string form _to_matlab_cell_str already produces for filenavigator.fileparameters.
2. Build one reader per file-parameter entry when the spec has several, matching +setup/lab.m. Error rather than guess when several classes are given alongside a single file parameter (PR NDI-python 2026-08 catch-up — hardening bundle + MATLAB parity + CI safety #61 commit 576e7d1 took that position).
3. Port ndi.setup.sync — a new src/ndi/setup/sync/ package with add_sync_rules, mirroring +setup/+sync/* at MATLAB 881919d39, 928de391c, 68431eb38, ffe310085. Support force_update.
4. Vendor ndi_common/sync_rules/ from NDI-matlab (vhlab/vhintan_intan2spike2.json, vhlab/vhtaste_sync2bpod.json at minimum) — the directory does not exist in this repo today.
5. Install the default filematch(2) syncrule in lab().
6. Related, found while porting: syncrule class resolution silently falls back to the abstract base on an unknown name instead of erroring. Fix that in the same pass.

Test surface

PR #61 carried 36 tests for this (tests/test_setup_lab.py, tests/test_setup_sync.py, commits de693e9, 280826a, 576e7d1, b20a188). The symmetry proof is the blankSession comparison asserting metadata-reader file parameters and installed syncrules on both sides — without that assertion the make/read pair passes while both languages produce nothing.

Reference commits on catchup/ndi-python-2026-08: de693e9, 280826a, 576e7d1, b20a188.