Board 07 real SDRAM memory test

Current evidence passes the assembly release checks; this does not establish tested hardware performance.

• Connectivity and design checks: passed — Zero errors/warnings; native ERC, label/copper LVS and manifest passed.
• Native design rules (DRC): passed — Fresh native DRC: zero violations/opens after saved zone refill; independent repeated refill has identical copper polygons. All tracks are orthogonal or exact 45 degrees.
• Manufacturing artifacts: passed — Regenerated Gerbers, drawings and renders; project/source ZIP byte provenance and complete SHA256 manifest verified after fresh full checks.
• Bill of materials: passed — 43 reviewed real components, all in the JLCPCB BOM/CPL: 40 SMT placements and three through-hole headers (J1-J3, fab-assembled since #7239); automatic matching disabled. CPL in the Gerber/drill frame (#7059, #7241); see procurement-review.md.
• electrical: passed — All length-spread, clock-relative, impedance and driver-load screens pass. Symmetric clock track/via spacing passes. Short package escape deviation explicitly reviewed; hardware and IBIS corner testing pending.
• physical geometry: passed — Fresh source matches 43 packages and 216 pad/net bindings. Full-span standard vias, reserved reference planes, intended signal-layer groups and zero SMT drill overlaps verified.

Passed: this check passed for the recorded files. Failed: this check found a problem. Not run: no result was established. Unlisted checks have no reported result.