[iamhyc]

What and why

Cut 26.0.0-9. Three pull requests landed since 26.0.0-8 and the version has not moved.

• Cargo.toml, Cargo.lock, npm/package.json and the five npm/platforms/* manifests all
  say 26.0.0-9; the launcher's dependency pins match. The release guard fails the run when
  Cargo.toml and npm/package.json disagree, so they move together.
• CHANGELOG.md: the Unreleased section becomes 26.0.0-9 and a fresh Unreleased heading
  is left at the top.
• The hdc wire-protocol work (feat(hdc): speak the hdc wire protocol natively #41) had no CHANGELOG entry at all. It is now recorded under
  Changed, next to the other in-process replacements.

Merging this to main makes v26.0.0-9 new, so release.yml builds the three targets,
publishes the GitHub release and pushes to npm without a tag being pushed by hand.

Checks

• cargo fmt --all --check is clean
• cargo clippy --all-targets -- -D warnings finishes without warnings
• cargo test passes
• Behaviour changes come with a test
• Any claim about engine/SDK/device behaviour states how it was measured
• --help text and comments naming a changed command are updated
• CHANGELOG.md has an entry if the CLI surface or project format changed

Tested with

cargo fmt --all --check                      → FMT_OK
cargo clippy --all-targets -- -D warnings    → 0
cargo test                                   → 533 passed; 0 failed; 4 ignored
cargo run -- --version                       → hvolt 26.0.0-9 (SDK 26.0.0)
grep -A1 '^name = "hvolt"' Cargo.lock        → version = "26.0.0-9"
grep -c '26.0.0-8' Cargo.toml npm/           → 0 (no stale pin)