fix(usage): repair cost analytics and display precision
- Automatic OpenRouter pricing sync with cost backfill for traces/snapshots/events
- Live usage data merging for current-hour dashboard accuracy
- 2-decimal API cost formatting across usage/overview pages
- Comprehensive test coverage (PG, SQLite, HTTP, UI)
Merged by github-maintain automation.
CalculateCost previously ignored usage.ThinkingTokens entirely, causing
cost underestimation for every reasoning-capable model (OpenAI o3/o4-mini,
Codex/GPT-5, Anthropic extended thinking).
Thinking tokens are reported by providers as a sub-count of completion
tokens — OpenAI completion_tokens already includes reasoning_tokens,
Codex output_tokens likewise, and Anthropic output_tokens counts thinking
at the output rate. Default behaviour (ReasoningPerMillion=0) now matches
provider billing semantics: full CompletionTokens priced at OutputPerMillion,
no double-counting.
When ReasoningPerMillion is explicitly configured, the completion bucket is
split into visible output + thinking and each priced independently. Defensive
clamp to zero when Anthropic's thinkingChars/4 estimate exceeds reported
OutputTokens.
Adds ReasoningPerMillion field to ModelPricing and 7 regression tests
covering the double-count gate, distinct-rate split, Anthropic estimate
overrun, and backward compatibility for non-reasoning models.
- A1+C2: Include token usage in run.completed event payload for WS clients
- A2: Cost tracking with model pricing config, cost calculation, and cost summary API
- A3: Budget enforcement per agent with monthly budget limits (migration 000015)
- C1: External wake/trigger API (POST /v1/agents/{id}/wake) for orchestrators
- C3: Activity audit trail with structured logging and queryable API
- UI: Activity page, cost stat card on overview, budget section in agent detail
- i18n: Complete en/vi/zh translations for all new features
Duc Nguyen