Link saved native comparisons with shared slice and probe

[MrScripty]

Saved native comparisons need a shared physical slice and probe while preserving their exact recorded evidence. Add a bounded two-pane sample view that explicitly reloads the two pinned selections through the existing run-set owner and public recording::comparison::compared_values, then paints cached native samples with one common range. Both panes share axis/index/probe, display actual per-side time/stage/interval and physical XYZ, and retain native cell/face association and pressure-gauge diagnostics.

Stacked on #91 at b38c3fe. Exactly the three new files allocated in the lead handoff change. No existing source, root registration, numerical reduction, renderer, worker/store, source inventory or admission receipt changes. Root integration and all merges remain lead-owned.

Call ComparisonFieldView::default() once and view.show(ui, page.selected_pair()) AFTER page controls update each frame. Only the explicit Load action opens sources or reduces fields. Changed/unverified/unavailable selections clear both panes immediately; failed reload clears this view's arrays. The page separately owns its last-checked metrics/status. Cache labels explicitly state last successful verification and no background source monitoring. Preflight source/publication/payload/sample/plane limits are documented; retained bytes are not RSS.

Validation on the exact frozen files now committed at 76cc71af9f2750354924eda30313eb7dbacf8c46:

• 67 focused desktop contracts pass: 9 view, 20 numerical, 12 artifact, 9 page, 17 run-set. Core-only 20 pass. Scoped Clippy with warnings denied, formatting and whitespace checks pass.
• Independent review approved exact view 911b7095, tests 6a0454a1, docs 3e8f47cb after fresh 9-contract/Clippy/format runs. The actual slice-edit regression is covered by keyboard events; both pane probes use actual egui pointer events. Real closed/pinned Jacobi/SGS archives exercise all six roles, gauge/sample geometry/time, failures and limits.
• Actual native eframe harness on software X11/llvmpipe reopened a saved result Unverified→Verify→explicit Load; edited slice/probes in both panes and matched physical time; checked pressure/direct and nonzero mean-offset diagnostic, X-face dimensions/offsets and X/Z normals. Cached painting continued with an owned archive hidden; explicit reload cleared fields; page recomputation reported Missing and cleared metrics; archive restored byte-exact, reload recovered, Close exited 0.
• Independently authored stdlib SQLite/IEEE oracle verified 14 actual displayed states (physical probe, native sample, units, per-side time/dt/stage/pressure interval, common bounds) in normal/-O/PYTHONOPTIMIZE=1 and rejected the deliberately perturbed probe at the intended check in all modes.

Executor evidence: /tmp/rheon-linked-field-view-freeze.json; /tmp/rheon-linked-native-observation.json SHA256 a8f04c1fc2c0fdd43a163a174e0dcd2e6288f2f38352127c50f7eac227da5c20. Harness binary SHA256 b73ac3d9c11f0df39709d4fc0889a338124f651ab0ac0c212d3045092e61a99f; source/log/oracle/screenshot hashes are in the observation manifest. Generated material is outside Git.

Keep draft pending lead root registration, fresh integrated native-window/source-admission evidence and applicable CI. The harness is not whole-product GUI acceptance, hardware GPU validation, build authenticity, trained-model parity or full generic M2–M3 acceptance. Typed teacher/stop capture and physically qualified accepted-provider composition remain separate gates. Preserve dependency branches until the stack no longer needs them.

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[MrScripty]

Read-only source admission audit on exact head76cc71af9f2750354924eda30313eb7dbacf8c46:95 reviewed paths versus96 actual; only added path is src/bin/desktop/comparison_field_view.rs, exact SHA256 911b7095ccc2897d811b7946a5fabadc31703263879bec73d9b8f082573d1106. Zero existing source changes and zero missing paths. /tmp/rheon-pr93-native-inventory-audit.json; this is not qualification or an inventory refresh. The lead must review/record the integrated root+component source and rerun fresh admission/native/rational evidence. Current CI remains running/queued; no gate edits or receipt reuse.

Native verification finished with exact source hashes unchanged; owned Xvfb server was stopped after the harness closed with exit0 and no visible test windows remained. Both fixture source SHA256 values were rechecked after byte-exact restoration.

[MrScripty]

Repository cleanup: closing this superseded scoped proposal. Its reviewed change is incorporated on main d8771ad83c30644d29929c96534548ce238bb357 through 90ee568b60ce9fefa4ad0455538caa6c0dc9b7b6, 133a9423c8e554ba8dce24b1f9b3c04e89ba2f3e. The linked cell/face slice/probe view, identity-bound cached loading, physical geometry/time/gauge and failure invalidation are present. Main extends its source adapter to configured saved sources; the original field-view API document remains byte-identical. Independent source/history review confirmed that the allocated product change is retained. The original branch is not classified as fully merged and is retained by this cleanup.