fix(models): add claude-fable-5-1 to the curated Anthropic picker list

[jquesnelle]

Anthropic's /v1/models lags freshly-routed aliases, and the picker only surfaces a model the live catalog omits when it is in the curated list. Family-keyed tables (context length, output cap, mandatory thinking, reasoning timeouts) already match the claude-fable prefix.

[alt-glitch]

This was generated by AI during triage.

Supersedes the claude-fable-5.1 half of #102684 (which also adds claude-opus-5 and targets the pre-split hermes_cli/models.py). Related prior catalog work: #43103, #100577.

[kshitijk4poor]

Landed via #106636 (merged as e306374): the curated Anthropic list now carries the alias as claude-fable-5.1 (dot form) — agent/anthropic_message_convert.py normalize_model_name() rewrites dots→hyphens on the wire, and the reasoning-floor / context-length lookups already resolve it, so both spellings are functionally equivalent and the picker shows the same form the aggregators use. Closing as fixed. Thanks @jquesnelle!