feat: add Reachability Center and Why Drawer components with tests

- Implemented ReachabilityCenterComponent for displaying asset reachability status with summary and filtering options.
- Added ReachabilityWhyDrawerComponent to show detailed reachability evidence and call paths.
- Created unit tests for both components to ensure functionality and correctness.
- Updated accessibility test results for the new components.

docs/api/gateway/advisory-ai.md

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+# Gateway Advisory AI API (Web I)
+
+**Status:** Interim contract shipped by Web I to unblock SDK/UI work. Align to the authoritative Advisory AI OpenAPI when the gateway routing plugin publishes it.
+
+## Overview
+- Gateway routes advisory AI traffic under `/advisory/ai/*`.
+- Web clients must send tenant + trace headers and should avoid sending raw prompts in telemetry; use prompt hashes instead.
+
+## Headers
+- `X-StellaOps-Tenant` (required)
+- `X-Stella-Project` (optional)
+- `X-Stella-Trace-Id` (required)
+- `X-Stella-Request-Id` (required; defaults to trace ID)
+- `X-StellaOps-AI-Profile` (optional; e.g. `standard`)
+- `X-StellaOps-Prompt-Hash` (recommended; send a stable hash, not the prompt)
+
+## Scopes
+- Read: `advisory-ai:read`
+- Write/operate: `advisory-ai:write`
+
+## Endpoints
+
+### `POST /advisory/ai/jobs`
+Creates a new advisory AI job.
+
+- Request: `docs/api/gateway/samples/advisory-ai-start-job.json`
+- Response: `docs/api/gateway/samples/advisory-ai-start-job-response.json`
+
+### `GET /advisory/ai/jobs/{jobId}`
+Returns job status and optional results once completed.
+
+### `POST /advisory/ai/jobs/{jobId}/cancel`
+Cancels a queued/running job.
+
+### `GET /advisory/ai/jobs/{jobId}/events`
+Server-sent events stream (JSON payload per message):
+
+- Sample NDJSON: `docs/api/gateway/samples/advisory-ai-job-events.ndjson`
+