public: publish selfhost snapshot to public repo (SSOT using + AST merge + JSON VM fixes)

- SSOT using profiles (aliases/packages via nyash.toml), AST prelude merge
- Parser/member guards; Builder pin/PHI and instance→function rewrite (dev on)
- VM refactors (handlers split) and JSON roundtrip/nested stabilization
- CURRENT_TASK.md updated with scope and acceptance criteria

Notes: dev-only guards remain togglable via env; no default behavior changes for prod.

plugins/nyash-json-plugin/src/tlv_helpers.rs

@@ -126,4 +126,4 @@ pub fn read_arg_i64(args: *const u8, args_len: usize, n: usize) -> Option<i64> {
         off += 4 + size;
     }
     None
-}
+}