release: v0.4.7

[avifenesh]

Summary

• release the Artix and non-systemd installer fixes merged after v0.4.6
• publish keyboard-readiness and portal capability corrections as v0.4.7
• synchronize Cargo, npm, MCP, lockfile, and changelog versions

Validation

• cargo fmt --all -- --check
• cargo check --locked --all-targets
• cargo clippy --locked --all-targets -- -D warnings
• cargo test --locked --no-fail-fast
• installer regression suite (8/8)
• rustdoc, cargo package, cargo audit
• MCP safety: 18 tools, version 0.4.7
• agnix self-lint
• npm pack dry run
• Node/Zod MCP schema validation