[George-RG]

Fixes #28

Field set() did a whole-register read-modify-write, echoing the read value back for every other field's bits. That silently corrupts fields with write side effects (woclr, wzc, etc.) and is unsafe on registers with read side effects (rclr, rset), since the RMW's own read destroys them.

• Onwrite-hazard fields: substitute the safe no-op value for those bits instead of echoing the read value.
• wclr/wset/wuser fields trigger on any write regardless of data, so no safe value exists — these just get a generation-time warning instead, since nothing in software can protect them.
• Onread-hazard fields: static_assert on per-field set(), forcing a whole-register write instead.
• Regenerated examples/generated/* to match.

Tested by compiling generated output against real memory with woclr, wzc, and rclr fields — siblings are no longer disturbed, and the rclr case fails to compile as intended.

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