Fix paired-field Cells measurement identity (#314)

[trissim]

Summary

Closes #314 and #322. Parent owns integration. Normally merged current main8e478cb21; the existing source-image-set identity owner now distinguishes fixed paired-field coordinates from selected plane membership. Existing NamedSourceBinding.component_values remains assignment/selector authority. Consumers/exporters do not gain CSV joins, copied metadata, module switches or another registry.

The actual installed journey exposed #322: ConvertImageToObjects called image.copy on a metadata-bearing runtime carrier. Its existing NumPy conversion owner now supplies the owned numeric working copy through np.asarray(image).copy(); original main flow, label-builder source, pixels, provenance and declared spacing remain intact. No forwarding shim or guard weakening.

Current evidence

• Rich/plain and connected/preserved-label regression: original two rich cases fail, two plain controls pass; all repaired cases preserve exact labels, counts, area, source pixels, main identity, provenance/domain and declared XY spacing.
• 51 focused object-output, source-identity and real exporter checks plus four rendering controls pass at the integrated source.
• Original unmodified packaged ratchet compares 5,133 metrics against current main with zero positive deltas. Original full-context NRA/R1 deadlines remain incomplete, not formal passes; the owner explicitly said not to block locally/live-verified shipment on NRA.
• Actual built OpenHCS wheel plus recorded ArrayBridge companion are installed in the isolated candidate. Fresh MCP health reports site-packages, 56 packaged resources and no stale source.
• Continuous installed MCP inspection/compile/execute/export completes across two tiny synthetic wells. Final executionbb932c48-de7a-4867-bbb2-5a090a5aa928 completes in1.11s, including strict final metadata reconciliation.
• Native result-directory inventory returns all16 results without truncation. Cells.csv has exactly four complete rows: two objects per independent field, matching parent labels, coexisting location and shape, no blank feature fields, expected52-pixel cell areas. Native CSV previews match disk exactly.
• Four physical label projections reopen with correct32x32 domains, exact nucleus masks and52-pixel cell identities. All synthetic source images retain their known fixture pixels. The existing gzip-pickle observation owner reopens the exported run and confirms both wells succeeded.
• Exact owned child is acknowledged closed/process_exited; MCP exits and independent PID/socket checks confirm shutdown. Runtime logs are archived before owned scratch/build cleanup; no duplicate Fiji download or shared installation edit.

Preserved failures and limits

The first installed predecessor failed at image.copy and is retained. The repaired copy then exposed a parent-authored control mistake: KnownCells inherited previous DNA-only main flow instead of selecting original Actin main flow. Reflected schema and existing importer confirm the fix is the existing lazy input_source=PIPELINE_START declaration, not a production fallback. That failure and output remain; final run uses a separate output directory with unchanged algorithms/settings.

A receipt helper initially hit its PTY canonical input-size limit before dispatch. A fresh MCP client reconnects with corrected terminal capture to the same original native child; startup/execution are not replayed and10s observation deadlines are unchanged.

This generic source-binding control does not declare physical calibration; it proves field/row identity in pixels, not installed physical-unit, visual biological QA or a promoted recipe. H003e remains immutable REJECT with no scientific-data access, rerun, retune or held-out/reference answers opened. Full ZIP/R0/R1 completion remains outside this checkpoint.

Canonical receipt: docs/validation/paired_field_csv_314_20260930/installed-parent-checkpoint.rst.

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