[trissim]

Addresses #445. Working source checkpoint published; installed/native receiving remains open. This is missing original-channel QA access, not a demonstrated channel swap.

Receiving head bfbfd21; exact qualified production head 1075123, based on main 3df650b. Source tests/R0 are terminal. No CI wait, install, native startup, scientific read/run, process mutation or cleanup.

What works in source

• Original explicit acquisition-handler query exposes all exact store-declared planes after C1-only workspace preparation. Select C3 by the actual returned record metadata and use its returned virtual_path for exact sample/stream; no guessed name or fabricated source receipt.
• Auto OpenHCS/workspace query/sample and the original generic pipeline/Image Browser inventory keep the persisted C1 selection. Metadata remains byte-exact.
• Exact C3 bounded samples and the original stream-source projection/loader match the small engineering arrays, retaining calibration.
• Ambiguous physical container paths fail through the unchanged typed resolver with no sample; they are not channel selectors.

Ownership / NRA

Shared read-only source/workspace resolution belongs on existing PlateImageInventory.from_read_only_handler. The service retains a small dispatch/error-reporting hook. PlateImageInventory.from_source_dataset replaces/reuses the original candidate loop; from_handler retains its old projection precedence. SourceCandidate/SourcePixelRef and the original sampler/stream projector remain authoritative. No new selector API, mode, concrete BioFormats switch, decoder, registry or mirrored catalog.

A fourth-channel declaration and an independent metadata leaf with cooperative super().source_dataset flow through unchanged consumers. No ornamental MI is introduced. Catalog review: BOUND-2/8, MEMB-1/2 and IMPL-12/13.

Singer owns #445 read-only source boundary and separate #404 receiving acceptance. Parent owns integration/native physical-channel QA. Root #394 retains shared source binding/metadata/projection/materialisation. Checked 919fee2 and later a5134a0; neither changed production path overlaps its roster. Exact scope: #394 comment5950317703. No shared/foreign WT edit and no #404 code imported. Planck scientific files/viewer untouched.

Evidence

Original source: 1 RED / 2 PASS, C3 hidden after C1 preparation; 4.60s / 240972KiB. Final owner-corrected source: 5 PASS, 4.87s / 240280KiB; 1CPU/512MiB/no-swap/60s kernel bound. Eleven existing inventory/DTO/path/source-ref controls passed at the first placement; no ceremony rerun.

Unmodified original pinned R0, all actual changed production files included: initial service growth +8 REJECTED, corrected by moving the algorithm to its existing inventory owner. Final PASS, no positive deltas, service excess -13; 17.82s / 87628KiB. No detector copy, excluded path or raised threshold.

Receipt: docs/validation/physical-source-inspection-445.rst.
Byte-exact full archive: docs/validation/physical-source-inspection-445-source-20261002.tar.gz
SHA256 ffc8001ed2d76c43626f6154f84b06fa54a4b1865f209ab4a00212d9b6ccef8a.
Original smaller archive, original red, three intervening harness failures and initial R0 failure are retained. Raw whitespace is not rewritten.
Test: tests/unit/agent/test_physical_source_inspection_445.py.

Parent must still qualify installed public C1/C3 matched raw/composite/nuisance QA. #445 is not auto-closed. #440/#441 installed acceptance and #404 native graph reopening remain independent.

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