Add model-native workspace file operations

Remove shell-escaped file mutation from the stable workspace flow by adding explicit file and patch tools across the CLI, SDK, and MCP surfaces.

This adds workspace file list/read/write plus unified text patch application, backed by new guest and manager file primitives that stay scoped to started workspaces and /workspace only. Patch application is preflighted on the host, file writes stay text-only and bounded, and the existing diff/export/reset semantics remain intact.

The milestone also updates the 3.2.0 roadmap, public contract, docs, examples, and versioning, and includes focused coverage for the new helper module and dispatch paths.

Validation:
- uv lock
- UV_CACHE_DIR=.uv-cache make check
- UV_CACHE_DIR=.uv-cache make dist-check
- real guest-backed smoke for workspace file read, patch apply, exec, export, and delete

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "pyro-mcp"
-version = "3.1.0"
+version = "3.2.0"
 description = "Stable Firecracker workspaces, one-shot sandboxes, and MCP tools for coding agents."
 readme = "README.md"
 license = { file = "LICENSE" }