feat: Added full cost tracking to Coyote and added it to the default right prompt

config.example.yaml

@@ -39,10 +39,11 @@ sync_models_ttl_hours: 24        # Hours before the synced model catalog is cons
 # Token-usage variables (set only when the provider reports usage, so guard them with {?var ...}):
 #   last_input_tokens, last_output_tokens, last_cache_read_tokens, last_cache_creation_tokens (most recent API call)
 #   total_input_tokens, total_output_tokens, total_cache_read_tokens, total_cache_creation_tokens (session cumulative)
+#   last_cost, total_cost (USD, formatted like 0.0142; set only when nonzero and every billed token type has a price)
 left_prompt:
   '{color.red}{model}){color.green}{?session {?agent {agent}>}{session}{?role /}}{!session {?agent {agent}>}}{role}{?rag @{rag}}{color.cyan}{?session )}{!session >}{color.reset} '
 right_prompt:
-  '{color.cyan}{?reasoning_effort [{reasoning_effort}] }{color.purple}{?last_cache_read_tokens ⚡{last_cache_read_tokens} }{?session {?consume_tokens {consume_tokens}({consume_percent}%)}{!consume_tokens {consume_tokens}}}{color.reset}'
+  '{color.cyan}{?reasoning_effort [{reasoning_effort}] }{color.purple}{?last_cache_read_tokens ⚡{last_cache_read_tokens} }{?total_cost ${total_cost} }{?session {?consume_tokens {consume_tokens}({consume_percent}%)}{!consume_tokens {consume_tokens}}}{color.reset}'
 
 # ---- Vault ----
 # See the [Vault documentation](https://github.com/Dark-Alex-17/coyote/wiki/Vault) for more information on the Coyote vault.