docs: update HOWTO.md with security auth flow, JWT headers, and config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

HOWTO.md

@@ -35,32 +35,66 @@ ClickHouse credentials: `cameleer` / `cameleer_dev`, database `cameleer3`.
 
 ```bash
 mvn clean package -DskipTests
-java -jar cameleer3-server-app/target/cameleer3-server-app-1.0-SNAPSHOT.jar
+CAMELEER_AUTH_TOKEN=my-secret-token java -jar cameleer3-server-app/target/cameleer3-server-app-1.0-SNAPSHOT.jar
 ```
 
-The server starts on **port 8081**.
+The server starts on **port 8081**. The `CAMELEER_AUTH_TOKEN` environment variable is **required** — the server fails fast on startup if it is not set.
+
+For token rotation without downtime, set `CAMELEER_AUTH_TOKEN_PREVIOUS` to the old token while rolling out the new one. The server accepts both during the overlap window.
 
 ## API Endpoints
 
+### Authentication (Phase 4)
+
+All endpoints except health, registration, and docs require a JWT Bearer token. The typical flow:
+
+```bash
+# 1. Register agent (requires bootstrap token)
+curl -s -X POST http://localhost:8081/api/v1/agents/register \
+  -H "Content-Type: application/json" \
+  -H "Authorization: Bearer my-secret-token" \
+  -d '{"agentId":"agent-1","name":"Order Service","group":"order-service-prod","version":"1.0.0","routeIds":["route-1"],"capabilities":["deep-trace","replay"]}'
+# Response includes: accessToken, refreshToken, serverPublicKey (Ed25519, Base64)
+
+# 2. Use access token for all subsequent requests
+TOKEN="<accessToken from registration>"
+
+# 3. Refresh when access token expires (1h default)
+curl -s -X POST http://localhost:8081/api/v1/agents/agent-1/refresh \
+  -H "Authorization: Bearer <refreshToken>"
+# Response: { "accessToken": "new-jwt" }
+```
+
+**Public endpoints (no JWT required):** `GET /api/v1/health`, `POST /api/v1/agents/register` (uses bootstrap token), OpenAPI/Swagger docs.
+
+**Protected endpoints (JWT required):** All other endpoints including ingestion, search, agent management, commands.
+
+**SSE connections:** Authenticated via query parameter: `/agents/{id}/events?token=<jwt>` (EventSource API doesn't support custom headers).
+
+**Ed25519 signatures:** All SSE command payloads (config-update, deep-trace, replay) include a `signature` field. Agents verify payload integrity using the `serverPublicKey` received during registration. The server generates a new ephemeral keypair on each startup — agents must re-register to get the new key.
+
 ### Ingestion (POST, returns 202 Accepted)
 
 ```bash
-# Post route execution data
+# Post route execution data (JWT required)
 curl -s -X POST http://localhost:8081/api/v1/data/executions \
   -H "Content-Type: application/json" \
   -H "X-Protocol-Version: 1" \
+  -H "Authorization: Bearer $TOKEN" \
   -d '{"agentId":"agent-1","routeId":"route-1","executionId":"exec-1","status":"COMPLETED","startTime":"2026-03-11T00:00:00Z","endTime":"2026-03-11T00:00:01Z","processorExecutions":[]}'
 
 # Post route diagram
 curl -s -X POST http://localhost:8081/api/v1/data/diagrams \
   -H "Content-Type: application/json" \
   -H "X-Protocol-Version: 1" \
+  -H "Authorization: Bearer $TOKEN" \
   -d '{"agentId":"agent-1","routeId":"route-1","version":1,"nodes":[],"edges":[]}'
 
 # Post agent metrics
 curl -s -X POST http://localhost:8081/api/v1/data/metrics \
   -H "Content-Type: application/json" \
   -H "X-Protocol-Version: 1" \
+  -H "Authorization: Bearer $TOKEN" \
   -d '[{"agentId":"agent-1","metricName":"cpu","value":42.0,"timestamp":"2026-03-11T00:00:00Z","tags":{}}]'
 ```
 
@@ -83,29 +117,36 @@ open http://localhost:8081/api/v1/swagger-ui.html
 
 ```bash
 # Search by status (GET with basic filters)
-curl -s "http://localhost:8081/api/v1/search/executions?status=COMPLETED&limit=10"
+curl -s -H "Authorization: Bearer $TOKEN" \
+  "http://localhost:8081/api/v1/search/executions?status=COMPLETED&limit=10"
 
 # Search by time range
-curl -s "http://localhost:8081/api/v1/search/executions?timeFrom=2026-03-11T00:00:00Z&timeTo=2026-03-12T00:00:00Z"
+curl -s -H "Authorization: Bearer $TOKEN" \
+  "http://localhost:8081/api/v1/search/executions?timeFrom=2026-03-11T00:00:00Z&timeTo=2026-03-12T00:00:00Z"
 
 # Advanced search (POST with full-text)
 curl -s -X POST http://localhost:8081/api/v1/search/executions \
   -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $TOKEN" \
   -d '{"status":"FAILED","text":"NullPointerException","limit":20}'
 
 # Transaction detail (nested processor tree)
-curl -s http://localhost:8081/api/v1/executions/{executionId}
+curl -s -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8081/api/v1/executions/{executionId}
 
 # Processor exchange snapshot
-curl -s http://localhost:8081/api/v1/executions/{executionId}/processors/{index}/snapshot
+curl -s -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8081/api/v1/executions/{executionId}/processors/{index}/snapshot
 
 # Render diagram as SVG
-curl -s http://localhost:8081/api/v1/diagrams/{contentHash}/render \
+curl -s -H "Authorization: Bearer $TOKEN" \
-  -H "Accept: image/svg+xml"
+  -H "Accept: image/svg+xml" \
+  http://localhost:8081/api/v1/diagrams/{contentHash}/render
 
 # Render diagram as JSON layout
-curl -s http://localhost:8081/api/v1/diagrams/{contentHash}/render \
+curl -s -H "Authorization: Bearer $TOKEN" \
-  -H "Accept: application/json"
+  -H "Accept: application/json" \
+  http://localhost:8081/api/v1/diagrams/{contentHash}/render
 ```
 
 **Search response format:** `{ "data": [...], "total": N, "offset": 0, "limit": 50 }`
@@ -117,38 +158,44 @@ curl -s http://localhost:8081/api/v1/diagrams/{contentHash}/render \
 ### Agent Registry & SSE (Phase 3)
 
 ```bash
-# Register an agent
+# Register an agent (uses bootstrap token, not JWT — see Authentication section above)
 curl -s -X POST http://localhost:8081/api/v1/agents/register \
   -H "Content-Type: application/json" \
+  -H "Authorization: Bearer my-secret-token" \
   -d '{"agentId":"agent-1","name":"Order Service","group":"order-service-prod","version":"1.0.0","routeIds":["route-1","route-2"],"capabilities":["deep-trace","replay"]}'
 
 # Heartbeat (call every 30s)
-curl -s -X POST http://localhost:8081/api/v1/agents/agent-1/heartbeat
+curl -s -X POST http://localhost:8081/api/v1/agents/agent-1/heartbeat \
+  -H "Authorization: Bearer $TOKEN"
 
 # List agents (optionally filter by status)
-curl -s "http://localhost:8081/api/v1/agents"
+curl -s -H "Authorization: Bearer $TOKEN" "http://localhost:8081/api/v1/agents"
-curl -s "http://localhost:8081/api/v1/agents?status=LIVE"
+curl -s -H "Authorization: Bearer $TOKEN" "http://localhost:8081/api/v1/agents?status=LIVE"
 
-# Connect to SSE event stream (agent receives commands here)
+# Connect to SSE event stream (JWT via query parameter)
-curl -s -N http://localhost:8081/api/v1/agents/agent-1/events
+curl -s -N "http://localhost:8081/api/v1/agents/agent-1/events?token=$TOKEN"
 
 # Send command to single agent
 curl -s -X POST http://localhost:8081/api/v1/agents/agent-1/commands \
   -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $TOKEN" \
   -d '{"type":"config-update","payload":{"samplingRate":0.5}}'
 
 # Send command to agent group
 curl -s -X POST http://localhost:8081/api/v1/agents/groups/order-service-prod/commands \
   -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $TOKEN" \
   -d '{"type":"deep-trace","payload":{"routeId":"route-1","durationSeconds":60}}'
 
 # Broadcast command to all live agents
 curl -s -X POST http://localhost:8081/api/v1/agents/commands \
   -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $TOKEN" \
   -d '{"type":"config-update","payload":{"samplingRate":1.0}}'
 
 # Acknowledge command delivery
-curl -s -X POST http://localhost:8081/api/v1/agents/agent-1/commands/{commandId}/ack
+curl -s -X POST http://localhost:8081/api/v1/agents/agent-1/commands/{commandId}/ack \
+  -H "Authorization: Bearer $TOKEN"
 ```
 
 **Agent lifecycle:** LIVE (heartbeat within 90s) → STALE (missed 3 heartbeats) → DEAD (5min after STALE). DEAD agents kept indefinitely.
@@ -177,6 +224,10 @@ Key settings in `cameleer3-server-app/src/main/resources/application.yml`:
 | `agent-registry.dead-threshold-seconds` | 300 | Time after STALE before DEAD |
 | `agent-registry.command-expiry-seconds` | 60 | Pending command TTL |
 | `agent-registry.keepalive-interval-seconds` | 15 | SSE ping keepalive interval |
+| `security.access-token-expiry-ms` | 3600000 | JWT access token lifetime (1h) |
+| `security.refresh-token-expiry-ms` | 604800000 | Refresh token lifetime (7d) |
+| `security.bootstrap-token` | `${CAMELEER_AUTH_TOKEN}` | Bootstrap token for agent registration (required) |
+| `security.bootstrap-token-previous` | `${CAMELEER_AUTH_TOKEN_PREVIOUS}` | Previous bootstrap token for rotation (optional) |
 
 ## Running Tests