nori_regression: point the model list at Synthefy's docs instead of duplicating it

[ajanbekzat]

What

The plugin kept its own list of Nori model slugs in four places: the README's "Supported models" table, the model argument's help text, the retired-slug error message, and the commented TOML config. Each is now a pointer to Synthefy's published list at docs.synthefy.com/nori/quickstart#models.

The plugin still names its own default (synthefy/nori-30m), because that is the plugin's behaviour rather than the vendor's catalogue.

Why

The copies were already stale. They list synthefy/nori-30m and synthefy/nori-6m only, while Synthefy currently publishes four entries, including synthefy/nori-100m and an API-only synthefy/nori-30m-thinking-medium. A user reading this README would not know the larger model exists.

Which models exist is not something this plugin can keep correct: it changes when Synthefy releases a variant, with no signal to this repository. Pointing at the vendor's list removes that failure mode instead of refreshing it once.

Also in this change

The per-slug cold-start figures ("about 69 seconds for nori-6m and 125 seconds for nori-30m") are replaced by a range. They were measured against two specific variants, and a cold start has since been observed at close to four minutes, so a precise pair of numbers reads as more of a guarantee than it is. The request_timeout default of 300s is unchanged and still absorbs it.

Testing

pytest influxdata/nori_regression/test_nori_regression.py
190 passed

The retired-slug error was rendered to confirm the new interpolation:

model slug 'synthefy/nori' is retired and no longer routes. Use 'synthefy/nori-30m' or
another current slug, listed at https://docs.synthefy.com/nori/quickstart#models.

Note

This is independent of #154, which renames the plugin's API key environment variable. Both touch README.md but in different sections, so they can merge in either order.

[ajanbekzat]

Folded into #154 so the plugin's Synthefy-facing details land in one change. Closing this one.