New pkg/chat/tool_handler.go: ToolCallHandler interface + ToolCall
type + BuildToolManifest helper + Core-action dispatch adapter +
inline {"tool_call": ...} JSON parser. Service.Send now detects
inline tool calls during stream, invokes OnToolCall, persists a
'tool' result message, and continues the completion loop. Manifest
is prepended to system prompt when a handler is registered
(no-op when unregistered — back-compat).
Good/Bad/Ugly coverage in tool_handler_test.go: valid tool_call
dispatches through mock executor and lands in history; unknown
tool name surfaces error into conversation (not a silent drop);
malformed inline JSON does NOT dispatch — stream continues, no
executor call, assistant message preserves the raw tool_call
fragment for audit.
go vet + go test ./pkg/chat/... clean (codex 0.124.0, gpt-5.5,
LEK AGENTS.md loaded).
Closes tasks.lthn.sh/view.php?id=22
Co-authored-by: Codex <noreply@openai.com>
Co-Authored-By: Virgil <virgil@lethean.io>
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