chore(release): bump version to 0.2.30

[shakkernerd]

Prepare v0.2.30. Squash-merge this pull request, update local main, then rerun scripts/release.sh 0.2.30 to sign and push the release tag.

[shakkernerd]

Merged using squash.

What changed after review:

• Kept the release commit strictly version-only.
• Bumped Cargo.toml and Cargo.lock from 0.2.29 to 0.2.30.
• Preserved the already-landed 0.2.30 changelog and release evidence.

Verification:

• Refreshed against current origin/main before merging.
• Release script: cargo fmt --check, full cargo test --locked, and cargo build --locked --release passed.
• AWS Crabbox cbx_acddb956ce9d: full Linux Rust 1.88 suite, Windows cross-check, package/install flows, historical OpenClaw upgrades, rollback, and current-stable runtime smoke passed.
• Real macOS: full suite, ARM64/Intel package checks, installer, historical upgrades, rollback, and current-stable runtime smoke passed.
• Auto-review: exact version-only diff manually verified.
• GitHub checks: Format, Rust 1.88 minimum, Windows compile, Ubuntu tests, and macOS tests passed.

Landed on main:

• Final landed SHA: 7bde7cb; range 60407a3...7bde7cb.

Thanks @shakkernerd!