feat(sdk): add domain types, typed errors, and Response wrapper

README.md

@@ -62,6 +62,7 @@ strategies, and adding new operations.
 | `node.status.get`       | Get node status        | Read-only  | [docs](docs/orchestration/node-status.md)        |
 | `node.disk.get`         | Get disk usage         | Read-only  | [docs](docs/orchestration/node-disk.md)          |
 | `node.memory.get`       | Get memory stats       | Read-only  | [docs](docs/orchestration/node-memory.md)        |
+| `node.uptime.get`       | Get system uptime      | Read-only  | [docs](docs/orchestration/node-uptime.md)        |
 | `node.load.get`         | Get load averages      | Read-only  | [docs](docs/orchestration/node-load.md)          |
 | `network.dns.get`       | Get DNS configuration  | Read-only  | [docs](docs/orchestration/network-dns-get.md)    |
 | `network.dns.update`    | Update DNS servers     | Yes        | [docs](docs/orchestration/network-dns-update.md) |

docs/orchestration/README.md

@@ -20,6 +20,7 @@ to an OSAPI job type that agents execute.
 | [`node.status.get`](node-status.md)           | Get node status        | Read-only  | Node     |
 | [`node.disk.get`](node-disk.md)               | Get disk usage         | Read-only  | Node     |
 | [`node.memory.get`](node-memory.md)           | Get memory stats       | Read-only  | Node     |
+| [`node.uptime.get`](node-uptime.md)           | Get system uptime      | Read-only  | Node     |
 | [`node.load.get`](node-load.md)               | Get load averages      | Read-only  | Node     |
 
 ### Idempotency

docs/orchestration/node-uptime.md

@@ -0,0 +1,29 @@
+# node.uptime.get
+
+Get system uptime information.
+
+## Usage
+
+```go
+task := plan.Task("get-uptime", &orchestrator.Op{
+    Operation: "node.uptime.get",
+    Target:    "_any",
+})
+```
+
+## Parameters
+
+None.
+
+## Target
+
+Accepts any valid target: `_any`, `_all`, a hostname, or a label selector
+(`key:value`).
+
+## Idempotency
+
+**Read-only.** Never modifies state. Always returns `Changed: false`.
+
+## Permissions
+
+Requires `node:read` permission.