Unify Peel workflow, sensor matching, and optional hardware display

[leopozh]

Peel now runs the original phone workflow with optional Seeed instrument control and BOX-3 display synchronization. This combines #21 and #23 into one app and one control layer; users can skip hardware without receiving fabricated sensor readings.

Final behavior

• Phone USB → Seeed → ESP-NOW → BOX-3 mirrors all eight workflow stages, with capability checks, acknowledgements, retries, and reconnect synchronization. Display failures do not block the app.
• Explicit water blanking, telemetry-confirmed start/stop, configurable run duration, USB/TCP diagnostics, and local raw logs preserve the tested instrument workflow.
• Scans store real absorbance and up to 256 aligned readings, including temperature, transmission/scattering, dark and color channels. Research receives bounded numeric evidence.
• A deterministic matcher compares absorbance against four generated reference curves using baseline subtraction, resampling, and RMSE. The UI says Closest match: with separate synthetic-library attribution. It reports ambiguity/out-of-range results and rejects flat or insufficient data. Bottle names do not determine the match. These synthetic profiles are demonstration fixtures, not validated chemical identification, purity, potency, or authenticity measurements.
• Voice keeps Viktor’s concise flow and parser/date fixes, with conversational phrasing instead of spoken Bottle/Imprint/Pill headings. It receives the computed match without raw telemetry or long hardware findings; numeric distances stay out of the greeting.
• Remove mock /pill and graph demo API behavior. Preserve explicit labeling of historical simulated records. Add additive Elasticsearch sensor/matcher mappings and backend CI.

Integration and validation

Includes both superseded PR histories and latest main through #28 (real hardware photo), with no duplicate controller app or instrument singleton. Keeps simulator/direct-debug launch options and optional hardware skip.

• Backend: 1,282 tests passed; 14 live tests skipped. Final voice wording: 48 targeted tests passed.
• Flutter: 95 tests passed; analyze clean; release APK built and installed on the Pixel.
• Python instrument simulator: 36 passed. C++ display protocol tests passed.
• Seeed and BOX-3 firmware previously built/flashed; all eight stages received actual radio render acknowledgements.
• Live backend verified computed reference ranking and conversational voice session responses. The user confirmed the app/voice works. Backend is deployed at eeab9e0; the subsequent merge only brings in README artwork.

APKs, credentials, firmware backups, and local trial exports are excluded from Git. The separate hardware-component checkout's pre-existing bench edits are outside this PR.