chore: release v0.9.0

[oboard]

Summary

Version bump 0.8.0 → 0.9.0 after the static asset middleware rewrite (#29).

Minor (breaking for 0.x): ServeStaticProvider::get_meta/get_contents are now async fn, so third-party provider implementations need to adapt. oboard/mocket/static_file gained optional fallthrough/index_names parameters and now resolves MIME types via oboard/mimetype@0.2.0.

Verification (on merged main, a982650)

• moon check --deny-warn clean; moon info --target native / moon fmt produce no diff.
• moon test --target js,native: js 87/87, native 82/82.
• Live socket-level re-run of the original issue reproduction table: all rows pass (index serving, MIME/ETag/Content-Length, unrelated & short routes, traversal confinement, 405, 304).
• moon publish validation passed (packaged zip extracted + moon check green, server 200 OK) — oboard/mocket@0.9.0 is on mooncakes.

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