refactor(asio): make module package canonical

[wellwei]

Summary

• retire the transitional compat.asio@1.38.1 header-only package and its consumer tests
• replace the chriskohlhoff.asio package identity with canonical default-root asio@1.38.1
• preserve the existing C++23 module wrapper and separate-compilation recipe, with concise cautions, limitations, and unexported-component notes

Consumer contract

mcpp add asio@1.38.1

import std;
import asio;

compat.asio@1.38.1 and chriskohlhoff.asio@1.38.1 are removed without aliases. The canonical package is module-only.

Validation

• Lua syntax and mirror-table checks
• strict descriptor parse with workflow-pinned mcpp 0.0.101
• isolated macOS arm64 mcpp test -p asio-module: 5 passed, 0 failed
• executable descriptor table unchanged by the final documentation update

Linux and Windows module coverage is delegated to this PR CI.

No archive URL, SHA-256, mirror, generated wrapper, source list, feature, define, platform flag, or mcpp core behavior changes.

[wellwei]

Closing because internal planning/spec files were included in the branch. The branch will be cleaned before any replacement PR is proposed.

[wellwei]

Rebuilt the branch from current upstream/main. The PR now contains one refactor commit and only the 14 Asio package/workspace/test files; all internal planning, Superpowers, agent, and fork-workflow documentation has been removed from both the diff and commit history.

[wellwei]

Superseded by #109. GitHub refused to reopen this PR after the head branch was rebuilt. PR #109 contains the cleaned one-commit branch with only Asio package, workspace, and test changes, with no internal documentation.