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Ed Zynda
8b442d2cbc
Three additive primitives to the extension API: - OnLLMUsage event: per-LLM-call token + cost deltas attributed to the specific model/provider used for each round-trip. Derived from the SDK StepFinishEvent in the extension bridge. Enables accurate budget enforcement between calls instead of only at turn boundaries. - ctx.SetState / GetState / DeleteState / ListState: session-scoped, last-write-wins key-value store backed by a sidecar file (<session>.ext-state.json) outside the conversation tree. Reads are O(1), writes don't grow the JSONL, and the store is not duplicated on fork. State is preserved across hot-reloads. - Enriched AgentEndEvent: ToolCallCount, ToolNames, LLMCallCount, token deltas (input/output/cache-read/cache-write), CostDelta, and DurationMs populated by a per-turn aggregator. Existing handlers reading only Response/StopReason are unaffected. Includes unit tests for the state store, LLMUsage registration, enriched AgentEndEvent, turn aggregator, llmUsageMeta, and sidecar path derivation. Adds examples/extensions/usage-budget.go demoing all three primitives together. Documents the additions in README, the docs site (extensions overview, capabilities, examples), and the kit-extensions and kit-sdk skill guides. Fixes #53