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/console/exception-schema.md

@@ -1,20 +1,38 @@
-# Console Exceptions API Schema (draft placeholder)
+# Console Exceptions API Schema (Web I)
 
-**Status:** TODO · awaiting Policy Guild + Platform Events
+**Status:** Interim contract shipped by Web I to unblock SDK/UI work. Align to the authoritative Policy/Events schema when published.
 
 ## Scope
-- `/exceptions` CRUD/workflow (create, propose, approve, revoke, list, history) proxied by Web gateway.
-- Audit logging, pagination, notification hooks, rate limits, RBAC scopes.
+- `/exceptions` CRUD/workflow (create, propose, approve/reject, revoke, list, history) proxied by the gateway.
+- Deterministic pagination (`continuationToken`), stable sorting, and explicit audit trails.
 
-## Needed from owners
-- JSON schema for exception entity and workflow transitions; validation rules.
-- Required scopes/roles; audit fields; pagination/sorting defaults; max durations/guardrails.
-- Notification hook contract (`exception.*` events) and rate-limit policy.
-- Sample payloads for each state and error cases.
+## Headers
+- `X-StellaOps-Tenant` (required)
+- `X-Stella-Project` (optional)
+- `X-Stella-Trace-Id` (required)
+- `X-Stella-Request-Id` (required; defaults to trace ID)
 
-## Draft sample (placeholder)
-- See `docs/api/console/samples/exception-schema-sample.json` for a skeleton payload covering `pending_review` state.
-- Replace with authoritative samples once schema is published.
+## Scopes
+- Read: `exception:read`
+- Create/edit: `exception:write`
+- Approve/reject/revoke: `exception:approve`
 
-## TODO
-- Replace with ratified schema + samples; log hash/date; link from Web I/II sprint logs.
+## Endpoints
+- `GET /exceptions?status=&severity=&search=&sortBy=&sortOrder=&limit=&continuationToken=`
+- `GET /exceptions/{exceptionId}`
+- `POST /exceptions`
+- `PATCH /exceptions/{exceptionId}`
+- `DELETE /exceptions/{exceptionId}`
+- `POST /exceptions/{exceptionId}/transition`
+- `GET /exceptions/stats`
+
+## Entity shape
+This doc mirrors the web contract used by the Angular SDK (`src/Web/StellaOps.Web/src/app/core/api/exception.contract.models.ts`).
+
+- Sample exception: `docs/api/console/samples/exception-schema-sample.json`
+
+## Status transitions (baseline)
+- `draft` → `pending_review` (submit)
+- `pending_review` → `approved` | `rejected`
+- `approved` → `revoked`
+- `approved` → `expired` (timebox lapse; system-driven)