Align standards and docs with current library surface

[codeforester]

Problem

The documentation has small drift after the GitHub helper and standalone launcher additions:

• STANDARDS.md lists the public sourceable library files but omits lib/bash/gh/lib_gh.sh.
• lib/bash/std/README.md includes a standalone source example that still points at /path/to/base/lib/bash/std/lib_std.sh instead of base-bash-libs.

Fix

Update the standards list and stdlib README examples so the documented sourceable library surface matches the current repository.

Validation

• git diff --check
• ./tests/validate.sh