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Agent #18 — Senior Android Engineer (R307 + BiometricPrompt fallback) — replaces former iOS slot

Reports to: Agent #4. Mandate: Owns R307 fingerprint sensor driver over USB-OTG; BiometricPrompt fallback for non-R307 path. KPIs: see role 18 in ../03-team.md.

Week 1 (2026-05-25 → 2026-05-29)​

A18-W1-Mon (2026-05-25) — R307 datasheet review + protocol mapping

  • Done when: R307 packet format, command set, response codes documented.
  • Output: docs/team/mobile/r307-protocol-reference.md.
  • Verify: covers AUTOIDENTIFY, GETIMAGE, GENCHAR, MATCH commands.
  • Reviewer: Agent #4.
  • Depends on: A04-W1-Mon.

A18-W1-Tue (2026-05-26) — USB-OTG enumeration spike (outside Android app, on host Linux)

  • Done when: USB device descriptor read for an R307 unit.
  • Output: docs/team/mobile/r307-host-spike.md.
  • Verify: vendor ID + product ID identified.
  • Reviewer: Agent #4.
  • Depends on: A18-W1-Mon.

A18-W1-Wed (2026-05-27) — Survey USB-Serial Android libraries

  • Done when: 3 candidate libraries compared (usb-serial-for-android, FTDI driver, libusb wrapper).
  • Output: docs/team/mobile/usb-serial-library-survey.md.
  • Verify: comparison covers licensing, supported chipsets, perf.
  • Reviewer: Agents #4, #11.
  • Depends on: A18-W1-Tue.

A18-W1-Thu (2026-05-28) — Library choice + ADR 0017 draft

  • Done when: ADR 0017 (USB-Serial library decision) drafted.
  • Output: adr/0017-usb-serial-library.md draft.
  • Verify: dep-add skill steps followed.
  • Reviewer: Agent #4.
  • Depends on: A18-W1-Wed.

A18-W1-Fri (2026-05-29) — Status post + R307 driver high-level design

  • Done when: design captures enumeration, command framing, response parsing, error recovery.
  • Output: docs/team/mobile/r307-driver-design.md v0.
  • Verify: covers tier-1 SKUs.
  • Reviewer: Agent #4.
  • Depends on: A18-W1-Thu.

Week 2 (2026-06-01 → 2026-06-05)​

A18-W2-Mon (2026-06-01) — Device-support matrix v0 (with Agent #4)

  • Done when: tier-1 list confirmed; tier-2 list seeded.
  • Output: contribution to docs/operations/device-support-matrix.md v0.
  • Verify: per-SKU StrongBox + BiometricPrompt + USB-OTG flags.
  • Reviewer: Agent #4.
  • Depends on: A18-W1-Fri.

A18-W2-Tue (2026-06-02) — ADR 0017 merge

  • Done when: ADR APPROVE + merged.
  • Output: merge commit.
  • Verify: dep-add skill audit clean.
  • Reviewer: Agents #1, #4.
  • Depends on: A18-W1-Thu.

A18-W2-Wed (2026-06-03) — BiometricPrompt fallback path design

  • Done when: capability-detection helper designed; fallback to BiometricPrompt with native sensor outlined.
  • Output: docs/team/mobile/biometric-fallback-design.md.
  • Verify: covers tier-2 SKUs without R307.
  • Reviewer: Agents #4, #12.
  • Depends on: A18-W2-Tue.

A18-W2-Thu (2026-06-04) — Mobile risk-register contribution

  • Done when: USB-OTG enumeration failures + R307 capture failures + fallback path failures added to mobile risk register.
  • Output: contribution to docs/team/mobile/risk-register-v0.md.
  • Verify: mitigations seeded.
  • Reviewer: Agents #4, #40.
  • Depends on: A18-W2-Wed.

A18-W2-Fri (2026-06-05) — Phase 0 R307 sign-off + status post

  • Done when: R307 design + ADR 0017 merged.
  • Output: row in docs/team/phase-exits/phase-0-mobile-signoff.md.
  • Verify: ADR + design referenced.
  • Reviewer: Agent #4.
  • Depends on: A18-W2-Thu.

Week 3 (2026-06-08 → 2026-06-12)​

A18-W3-Mon (2026-06-08) — R307 sensor arrival + physical inspection

  • Done when: 2 R307 units inspected against datasheet; serial numbers logged.
  • Output: contribution to docs/team/mobile/r307-procurement.md.
  • Verify: 2 units operational on Linux test rig.
  • Reviewer: Agents #4, #50.
  • Depends on: A04-W1-Thu.

A18-W3-Tue (2026-06-09) — R307 driver skeleton in mobile/sensors/r307/

  • Done when: skeleton module + USB-OTG enumeration logic landed.
  • Output: PR.
  • Verify: enumeration completes ≤ 1.5 s on Pixel 7.
  • Reviewer: Agent #4.
  • Depends on: A18-W3-Mon.

A18-W3-Wed (2026-06-10) — Cross-line architecture sync attendance

  • Done when: sync attended; R307 capture API contract aligned with prover input format.
  • Output: sync notes contribution.
  • Verify: notes published.
  • Reviewer: Agents #4, #17.
  • Depends on: A18-W3-Tue.

A18-W3-Thu (2026-06-11) — BiometricPrompt fallback path skeleton

  • Done when: capability-detection helper + fallback path landed.
  • Output: PR.
  • Verify: fallback path triggered on emulator (no USB-OTG).
  • Reviewer: Agents #4, #12.
  • Depends on: A18-W3-Wed.

A18-W3-Fri (2026-06-12) — Status post + R307 reliability test plan

  • Done when: test plan covers warm start, cold start, repeated capture, OTG cable swap, low light.
  • Output: docs/team/mobile/r307-reliability-test-plan.md.
  • Verify: each scenario has acceptance criteria.
  • Reviewer: Agent #24.
  • Depends on: A18-W3-Thu.

Week 4 (2026-06-15 → 2026-06-19)​

A18-W4-Mon (2026-06-15) — R307 GETIMAGE → GENCHAR capture pipeline on Pixel 7

  • Done when: capture on Pixel 7 produces a template hash on-device.
  • Output: PR draft for capture pipeline.
  • Verify: instrumented test confirms template descriptor SHA-256 computed.
  • Reviewer: Agents #4, #17.
  • Depends on: A18-W3-Tue.

A18-W4-Tue (2026-06-16) — R307 capture pipeline on Samsung S22

  • Done when: capture works on S22 with same R307 unit.
  • Output: contribution to docs/operations/device-support-matrix.md.
  • Verify: latency captured.
  • Reviewer: Agent #4.
  • Depends on: A18-W4-Mon.

A18-W4-Wed (2026-06-17) — Cross-line architecture sync attendance

  • Done when: sync attended; integration with C-143 enrollment flow agreed.
  • Output: sync notes contribution.
  • Verify: notes published.
  • Reviewer: Agent #4.
  • Depends on: A18-W4-Tue.

A18-W4-Thu (2026-06-18) — Sprint 1 R307 sign-off

  • Done when: R307 driver skeleton + fallback path skeleton merged.
  • Output: row in docs/team/sprint-exits/s1-mobile.md.
  • Verify: capture verified on 2 SKUs.
  • Reviewer: Agent #4.
  • Depends on: A18-W4-Wed.

A18-W4-Fri (2026-06-19) — Sprint 2 self-plan + status post

  • Done when: sprint-2 daily tickets drafted (C-167 R307 driver production, C-168 device-support matrix v1).
  • Output: docs/team/mobile/a18-sprint-2-plan.md.
  • Verify: 5 daily tickets.
  • Reviewer: Agent #4.
  • Depends on: A18-W4-Thu.