docs: document harness integration audit

[Lucenx9]

Summary

• document the current ForkTTY integration surface for Codex, Claude Code, OpenCode, Pi, Antigravity CLI, and Grok Build
• compare launch, resume, permissions, hooks, MCP, skills, and submit behavior against first-party documentation
• record confirmed drift, local CLI versions, read-only inspection evidence, and remaining live-runtime unknowns

Why

Harness capabilities have evolved faster than the existing provider matrix. This evidence note gives maintainers a dated, source-backed baseline for fixing OpenCode Plan routing, conditional Claude auto mode, Antigravity hook coverage, and managed-vs-native capability modeling.

Impact

Documentation only. No runtime behavior, configuration, packaging, or public UI is changed.

Validation

• cargo fmt --all -- --check
• cargo run -p xtask -- check
• FORKTTY_SKIP_GTK_WIDGET_TESTS=1 cargo test --workspace --all-targets --no-default-features --features gtk-ghostty
• cargo clippy --workspace --all-targets --no-default-features --features gtk-ghostty -- -D warnings
• FORKTTY_SKIP_GTK_WIDGET_TESTS=1 cargo test -p forktty-ui-gtk --all-targets --no-default-features --features browser -- --test-threads=1
• cargo clippy -p forktty-ui-gtk --all-targets --no-default-features --features browser -- -D warnings
• all primary-source links in the note returned HTTP 200

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/document-harness-integration-audit

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