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[hw] Reconcile PHY choice — 88E1512 in planning docs vs KSZ9031RNX in PCB_DESIGN.md #36

@marcos-mendez

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@marcos-mendez

Agent 2 Round 7 (Stays PR #35, 2026-05-06) chose Marvell 88E1512 as primary SGMII PHY for the schematic-capture planning docs (rationale: distributor stocking in LATAM, smaller package, NDA-free datasheet). However, the merged docs/PCB_DESIGN.md still references KSZ9031RNX as the PHY choice. This is an inconsistency between forward-looking planning and existing design doc.

Action: update docs/PCB_DESIGN.md to either (a) match the planning choice (88E1512 primary, KSZ9031RNX substitute) or (b) document why the discrepancy is acceptable (e.g. PCB_DESIGN.md is platform-agnostic spec, planning is implementation choice).

Trivial doc edit. File before the schematic-capture P4 (GbE host link) PR lands so there's a single source of truth.

Refs: Stays PR #35 (planning docs), PR #29 (DDR3L), PR #32 (VCCINT). Authored by Agent R (Reviewer).

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    stream-2FPGA Hardware (Agent 2) — KiCad, Stays primary

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