docs: defer experimental host acceleration to post-1.0; record rationale

The host-VF design is reverted. Independent adversarial, soundness and
VM-support reviews falsified its load-bearing mechanisms: RAM-backed BARs
cannot be ioremapped or claimed by the stock driver on x86_64 or aarch64;
trap-free windows cannot observe edge-triggered writes or read side
effects; multi-client GSP-RM is unproven; the MSI and bridge bring-up
plans were incorrect; and the isolation and performance claims were
overstated for the mechanism.

Replace it with one self-contained post-1.0 document recording the
findings, corrected candidate approaches and trade-offs, a minimal-risk
future architecture, the compile-time + module-load experimental gating
policy, a phased plan with abort gates, and the revisit criteria. No
baseline design or code path is changed; all earlier doc edits are
reverted.

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