fix(gateway): merge Portal API free recommendations into /model picker

[LifeJiggy]

Summary

The gateway /model picker only uses the static model-catalog.json for the
Nous Portal provider, missing dynamically-recommended models like DeepSeek V4
Flash (announced May 14 via Novita Labs promotion). The interactive CLI already
calls union_with_portal_free_recommendations() — this teaches

list_authenticated_providers() (used by the gateway) to do the same.

Related Issue

Fixes #28886

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)

Changes Made

• hermes_cli/model_switch.py:1169-1180 — after get_curated_nous_model_ids(),
  call union_with_portal_free_recommendations() to merge Portal API
  freeRecommendedModels into the nous provider's curated list. Falls back
  to the curated list on any error (silent degrade).

How to Test

1. Authenticate with Nous Portal on a free tier (hermes login nous)
2. Send /model via Discord or Telegram gateway
3. Previously: DeepSeek V4 Flash (and other recent Portal free models) missing
4. Now: Portal-recommended free models appear alongside the curated list

[alt-glitch]

Competing PR: #26910 addresses the same issue (#28886) with likely the same fix path in list_authenticated_providers(). Please coordinate to avoid duplicate work.

[LifeJiggy]

@alt-glitch
Updated approach.

Instead of tier detection + conditional calls (check_nous_free_tier →

union_with_portal_free_recommendations or union_with_portal_paid_recommendations), this adds a new combined helper union_with_portal_recommendations() that calls the Portal endpoint once and merges both freeRecommendedModels and paidRecommendedModels in a single pass. Net result: same coverage as #26910 but in 1 API call instead of 2-3, no tier detection, no branching.

Happy to coordinate — either approach solves the issue. Mine trades a slightly larger helper function for fewer API calls/simpler call-site logic; #26910 reuses existing per-tier helpers. Let us know which direction you prefer.

[LifeJiggy]

@teknium1 PTAL

[teknium1]

This is implemented on current main.

Automated hermes-sweeper review found the gateway /model path now uses Portal recommendation augmentation for Nous models:

• gateway/slash_commands.py:948 imports list_authenticated_providers(), and gateway/slash_commands.py:1168 calls it when building the /model list.
• hermes_cli/model_switch.py:1545 has a Nous-specific branch in list_authenticated_providers() that starts from the curated Nous list and mirrors the CLI picker behavior.
• hermes_cli/model_switch.py:1558 imports check_nous_free_tier(), union_with_portal_free_recommendations(), and union_with_portal_paid_recommendations().
• hermes_cli/model_switch.py:1573 calls the free recommendation union for free-tier users and the paid recommendation union otherwise, with a curated-list fallback on Portal failures.
• hermes_cli/models.py:580 implements the free recommendation helper by reading Portal freeRecommendedModels and adding missing model IDs.
• Blame attributes the main implementation to 51c68d4ab1a9e3c62fb1048fccb84144c409f0e7, which is contained in v2026.6.5.

This also matches the linked discussion: issue #28886 was already closed as implemented on main, and competing PR #26910 was closed after the behavior was present.