Beta.2 Runtime Resource Foundation Scope

This file tracks the first post-1.0.0-beta.1 runtime/resource foundation slice. It is main-branch work intended for a future 1.0.0-beta.2 bundle.

Implemented In This Slice

std.fs.open_text_read_result : (string) -> (result i32 i32) opens a text file for read-only resource-handle flow.
std.fs.read_open_text_result : (i32) -> (result string i32) reads remaining text from an open read handle.
std.fs.close_result : (i32) -> (result i32 i32) closes an open resource handle.
lib/std/fs.slo exposes matching explicit source facade helpers: open_text_read_result, read_open_text_result, close_result, read_text_via_handle_result, and close_ok.
Glagol lowers the new calls to private runtime symbols and keeps the existing concrete result families.
The test runner and hosted C runtime both enforce the same basic policy: invalid, missing, closed, or exhausted ordinary host failures return err 1 instead of panicking.

Resource handles are positive i32 tokens owned by the current process.
Handles are opaque Slovo values, not host file descriptors and not stable ABI values.
A handle is valid only until std.fs.close_result succeeds.
Reading a closed or invalid handle returns err 1.
Closing a closed or invalid handle returns err 1.
Resource cleanup is explicit in this beta slice; no finalizer, destructor, ownership transfer, or affine typing rule is claimed.