docs+runner+parser: SSOT+AST using finalized (legacy text inlining removed); provider verify reads nyash.toml; preflight warn hook; method-body guard removed; CURRENT_TASK updated for next JSON work

docs/guides/examples/README.md

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+# Examples: Plugin BoxRef Return (v2.2)
+
+- File: `plugin_boxref_return.nyash`
+- Purpose: Demonstrates a plugin method returning a Box (BoxRef/Handle), and passing Box as an argument.
+
+How to run (after full build):
+- Ensure `nyash.toml` includes FileBox with methods:
+  - `copyFrom = { method_id = 7, args = [ { kind = "box", category = "plugin" } ] }`
+  - `cloneSelf = { method_id = 8 }`
+- Build the plugin: `cd plugins/nyash-filebox-plugin && cargo build --release`
+- Run the example: `./target/release/nyash docs/examples/plugin_boxref_return.nyash`
+
+Expected behavior:
+- Creates two FileBox instances (`f`, `g`), writes to `f`, copies content to `g` via `copyFrom`, then closes both.