v0.13.1

A patch release: a max_tokens-derived context need reserves room for the
prompt, without moving a task that fits under the native window into a scaled
group. No on-disk format changes: meta.json identity stays schema 4 and
0.13.0 result directories resume, except where the served window changed
(below).

Migrating from 0.13.0

• A task's served window changes when its need comes from max_tokens, so its resume is refused. The window is part of the inference identity, and a resume never reruns inference. On a model sieval run launches with a known native window, a max_tokens below native that 0.13.0 served at exactly max_tokens, or at the recipe window with fewer than 4096 tokens to spare, is now served at native. The other tasks on that model's default plan share the window, so theirs changes too. A max_tokens at or above native is served in scaled group <model>@<max_tokens + 4096>, where 0.13.0 served it at max_tokens (in <model>@<max_tokens>, or unscaled when the recipe window held it). Start such a run fresh, or pin the recorded window with infer.overrides (context_length / max_model_len). A model whose tasks all fit the recipe window with 4096 to spare, or all set min_context or declare TaskRequirements.min_context, keeps its window (#239, #240).
• Where 4096 more no longer fits, the task is refused before launch: a max_tokens above context_limit - 4096 on an endpoint, above the plan's window minus 4096 when the native window is unknown, or above context.max - 4096 when scaled. Set the task's min_context if its prompts are known to be shorter (#239).

Fixed

• A raised serving window leaves room for the prompt. 0.13.0 raised a plan's window to exactly a task's max_tokens, so every request with a non-empty prompt was refused as longer than the context. A need derived from max_tokens now adds 4096 tokens for the prompt; min_context and a task's declared need already count it and are unchanged. A task with longer prompts sets min_context (#239, closes #238).
• A max_tokens below the native window is served at that window, never scaled. With the 4096 added, a task such as max_tokens: 38000 on a model with native: 40960 would move into a scaled (YaRN) group, and scaling changes outputs. Such a task now raises the window to native; its prompt gets native - max_tokens tokens, and a longer prompt is that sample's context overflow, as before. A max_tokens at or above native still gets max_tokens + 4096, in a scaled group when context.max and scaling allow (#240, refs #238).