address #3787 Codex round 2: board-gate PHY resets, session robustness

The board-specific PHY-reset nets move behind a board.h opt-in
(TRACE_ETM_QUIET_ENET_PHY on same70_xplained and mimxrt1170_evkb) so other
boards of those families cannot inherit a foreign GPIO write; the
chip-level trace pin muxes stay family-wide by design (same pattern as
stm32h7). same70 reference: width 1 is the validated default until the
J403.16 rework, and the hooks now wait (bounded) for PCKRDY3 before Ozone
arms trace. ra8m1 reference caches the boot ROM in AfterTargetConnect so
--attach sessions decode ROM execution too. etm_capture rejects an
unexpanded CMake JLINK_DEVICE with a clear error; PIO-USB + TRACE_ETM on
RP2350 is now a compile error (48 MHz trace clock is too slow for PIO-USB
and a runtime switch would desync the stream); etm_profile keeps
same-named statics from different modules as distinct rows.
Build-verified: same70_xplained, mimxrt1170_evkb, raspberry_pi_pico2.

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