feat(#238): scaffold rings/ for trios-fpga — FP-00 FP-01 FP-02 BR-BITSTREAM

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Summary

Additive ring scaffold for trios-fpga under L-ARCH-001 / Issue #238.
Crate src/ is untouched; rings are added as parallel workspace members.

Rings

FP-00 (hdl), FP-01 (synthesis), FP-02 (bitstream), BR-BITSTREAM (bitstream-output)

Packages

trios-fpga-fp00 trios-fpga-fp01 trios-fpga-fp02 trios-fpga-brbitstream

Compliance (R1, R5, R9, L7)

• R1 / R5 / R9 — ring isolation: each ring is a workspace member, no sibling imports
• L7 — additive only: parent crate src/ is unchanged
• Invariant I5 — every ring has RING.md, AGENTS.md, TASK.md
• cargo check -p trios-fpga-fp00 -p trios-fpga-fp01 -p trios-fpga-fp02 -p trios-fpga-brbitstream ✅

Safety note

Tier 4 FPGA crate. Stub rings have no FPGA deps — cargo check finishes in seconds. Heavy synthesis tooling continues to live in the parent crate.

Refs

• Closes part of [ARCH] Унификация всех 36 crates по образцу trios-a2a — ring-архитектура Gold/Silver/Bronze #238
• PR is draft — operator merges (no self-merge per ORDER-4)

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Anchor: phi^2 + phi^-2 = 3 · TRINITY · NEVER STOP

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L7 — additive scaffold only. Parent crate src/ not touched. Workspace builds: cargo check -p trios-fpga-fp00 -p trios-fpga-fp01 -p trios-fpga-fp02 -p trios-fpga-brbitstream finishes 0 errors. Awaiting operator merge.

Anchor: phi^2 + phi^-2 = 3 · TRINITY · NEVER STOP