Add persistent task workspace alpha

Start the first workspace milestone toward the task-oriented product without changing the existing one-shot vm_run/pyro run contract.

Add a disk-backed task registry in the manager, auto-started task workspaces rooted at /workspace, repeated non-cleaning exec, and persisted command journals exposed through task create/exec/status/logs/delete across the CLI, Python SDK, and MCP server.

Update the public contract, docs, examples, and version/catalog metadata for 2.1.0, and cover the new surface with manager, CLI, SDK, and MCP tests. Validation: UV_CACHE_DIR=.uv-cache make check and UV_CACHE_DIR=.uv-cache make dist-check.

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable user-visible changes to `pyro-mcp` are documented here.
 
+## 2.1.0
+
+- Added the first persistent task workspace alpha across the CLI, Python SDK, and MCP server.
+- Shipped `task create`, `task exec`, `task status`, `task logs`, and `task delete` as an additive
+  surface alongside the existing one-shot VM contract.
+- Made task workspaces persistent across separate CLI/SDK/MCP processes by storing task records on
+  disk under the runtime base directory.
+- Added per-task command journaling so repeated workspace commands can be inspected through
+  `pyro task logs` or the matching SDK/MCP methods.
+
 ## 2.0.1
 
 - Fixed the default `pyro env pull` path so empty local profile directories no longer produce