evo2 infer: generate CLI mode (steer from the command line)

[polinabinder1]

Summary

Adds a generate CLI mode so you can steer SAE features from the command line — a fourth
mode alongside serve / encode / batch. Stacked on #1622 (base = pbinder/evo2-sae-serve)
so the verified engine + server core stays frozen.

# 1. find an active feature on a sequence
./launch_inference.sh encode --sequence ATGGCC...GTGCAT --organism Human --top-k 8
#    → {"feature_id": 29244, "label": "motif_ATG", "max_activation": 109.8}, ...
# 2. steer generation with it (strength ~2-3x its peak; repeat --clamp for more features)
./launch_inference.sh generate --prompt ATGGCC... --organism Human --clamp 29244:300

What's here (diff vs #1622)

• cli.py: generate subparser + handler (reuses engine.generate); _parse_clamps turns
  repeatable --clamp FEATURE_ID[:STRENGTH] args into feature specs.
• launch_inference.sh: usage now documents generate + the encode→generate steering loop.
• tests/test_cli.py: CPU coverage of _parse_clamps (3 tests, pass).

Tests / verification

• _parse_clamps — 3 CPU tests pass (id:strength, default strength, empty).
• The generation path itself is the engine's generate, GPU-verified in evo2 SAE recipe: live inference engine + steering server + CLI #1622 (test_steering).

Merge #1622 first; GitHub auto-retargets this to main afterward.

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[polinabinder1]

Merged into the steering PR #1634, which now holds the generate CLI alongside the shared sae.steering primitive + harness, and unifies all clamping (engine/CLI/dashboard/harness) onto one implementation (sae.steering, B).

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