5ce4ab4d54* studio: emit one comma-chained --spec-type for CPU/Mac MTP path
llama-server takes a single --spec-type whose value may be
comma-separated to chain implementations (e.g. ngram-mod,draft-mtp).
The CPU/Mac MTP branch in LlamaCppBackend.load_model was passing
--spec-type twice in the same invocation, which is not the documented
chaining mechanism and silently drops one of the two specs depending
on llama.cpp's argv handling.
Collapse the pair to --spec-type ngram-mod,{mtp_token} and update the
stale _extra_args_set_spec_type docstring that claimed llama-server
accumulates repeated --spec-type. Update the matching pass-through
fixture in test_llama_server_args.py.
* studio: align MTP ngram-mod knobs with llama.cpp upstream defaults
Two correctness fixes against the llama.cpp server README:
1. The CPU/Mac comma-chained branch was emitting
--spec-ngram-mod-n-max 6 with --spec-ngram-mod-n-min 48, which is
nonsensical (min > max). Per the upstream default the value is 64.
2. The standalone ngram-mod branch was emitting --spec-ngram-size-n,
--draft-min, --draft-max. llama.cpp removed those arg aliases for
ngram-mod (they live only on the ngram-simple / map families now);
the correct knobs are --spec-ngram-mod-n-match / n-min / n-max.
Also refresh the inline comment block to point at the server README
rather than the older docs/speculative.md draft- aliases.
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