[BOT ISSUE] Add perplexity/sonar to model catalog (Perplexity Agent API)

[github-actions]

Summary

Perplexity's own perplexity/sonar model is listed on the Agent API with token-based pricing but is missing from the model catalog. This is Perplexity's first-party model exposed through the Agent API (distinct from the Sonar API sonar model which has per-request pricing).

Source verification

Field	Value	Source
Model ID	perplexity/sonar	Perplexity Pricing
Input cost	$0.25 / 1M tokens	Perplexity Pricing
Output cost	$2.50 / 1M tokens	Perplexity Pricing
Cached input cost	$0.0625 / 1M tokens	Perplexity Pricing

Cross-source verification

• Confirmed on Perplexity pricing page as an Agent API model with full pricing
• Confirmed on Perplexity guides/pricing page with matching pricing
• Not present in model_list.json (grep confirmed zero matches for "perplexity/sonar" — only perplexity/sonar-pro-search exists)
• No existing open GitHub issue covers this model ID

Notes

• perplexity/sonar is the Agent API variant with standard token-based pricing ($0.25/$2.50/$0.0625 per 1M tokens). This is distinct from the Sonar API model sonar which charges $1/$1 per 1M tokens plus $5–$12 per 1K requests
• The existing perplexity/sonar-pro-search entry (line 13343) has available_providers: ["openrouter"] and uses a different pricing structure ($3/$15) — it is a separate model accessed via OpenRouter, not the same as this Agent API model
• max_input_tokens and max_output_tokens are not included because Perplexity does not publish context window details for this Agent API model — these should only be added when officially documented
• Follows the perplexity/ prefix convention used by other Agent API models (perplexity/nemotron-3-ultra-550b-a55b, perplexity/kimi-k3, etc.)

[github-actions]

Autofix skipped because the issue body/title did not contain parseable bot metadata for a model catalog change.