docs: add developer and api reference tabs (#190)

* docs: add developer and api reference tabs

* fix: remove duplicate image

docs/api-reference/agents/runs/create.mdx

@@ -0,0 +1,7 @@
+---
+title: "Create Test Run"
+description: "Execute a workflow without placing a real phone call"
+openapi: "POST /api/v1/workflow/{workflow_id}/runs"
+---
+
+Creates a test execution of the workflow. No outbound call is placed — this is useful for validating agent behavior, checking prompt outputs, and testing tool integrations before going live.

docs/api-reference/agents/runs/get.mdx

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+---
+title: "Get Run"
+description: "Retrieve a single workflow run by ID"
+openapi: "GET /api/v1/workflow/{workflow_id}/runs/{run_id}"
+---
+
+Returns the full run record including status, transcript, recording URL, gathered context, and usage/cost info. Use `recording_url` and `transcript_url` to download artifacts, or use the [Download endpoint](/api-reference/calls/download) for time-limited public URLs.

docs/api-reference/agents/runs/list.mdx

@@ -0,0 +1,7 @@
+---
+title: "List Runs"
+description: "Retrieve all runs for a workflow"
+openapi: "GET /api/v1/workflow/{workflow_id}/runs"
+---
+
+Returns all runs for the given workflow, including both test runs and live call runs.