Implements Phases 1-3 of the ADR-096 roadmap:
Phase 1: workspace integration
- Add `ruvllm_sparse_attention` as a path-vendored workspace dep against
`vendor/ruvector/crates/ruvllm_sparse_attention`, default-features=false,
features=["fp16"]. Mirrors the no_std posture ADR-095 will need on the
firmware side so both consumers share a single feature set.
- Register `wifi-densepose-temporal` as workspace member.
Phase 2: AETHER temporal head
- `AetherTemporalHead` facade dispatches to a `SparseGqa` backend wrapping
`SubquadraticSparseAttention`. Selection rule from ADR-096 §4.4 enforced
at forward(): MHA branch when q_heads == kv_heads, GQA branch otherwise.
- `Dense` backend reserved (returns typed `DenseBackendNotImplemented`)
so config-time validation fails loudly instead of at forward().
- `TemporalHeadConfig::default_aether()` matches the AETHER training
default per ADR-096 §3.1 (window=32, block=16, q=4, kv=1 → MQA).
- Token 0 always wired as a global anchor — preserves AETHER's
contrastive "session-start reference" role per ADR-024.
Phase 3: smoke tests (5/5 passing)
- forward at AETHER default config, both MHA and GQA dispatch paths,
rejected dense backend, rejected non-divisible GQA ratio, and the
long-window roadmap target (N=1000, the 10s @ 100Hz case from
ADR-096 §3.1 — proves the kernel runs at lengths where dense MHA
costs 10⁶ edge ops vs sparse 10⁴).
Streaming `step()` deferred — KvCache lifecycle ties to PoseTrack per
ADR-096 §8.5 and lands when the firmware-side ABI does (Phase 4+).
Co-Authored-By: claude-flow <ruv@ruv.net>
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