b9464

speculative : fix n_outputs_max and remove draft-simple auto-enable (#23988)

• speculative : add common_speculative_n_max helper function

Extract the speculative max-draft-size logic from server_n_outputs_max
into a reusable common_speculative_n_max() function in common/speculative.

Assisted-by: llama.cpp:local pi

• cont : draft context always has n_parallel outputs

• llama : log n_outputs_max

• speculative : remove draft-simple auto-enable

• ci : enable server tests on PRs

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