chore(release): bump version to 0.3.4

[jaredLunde]

What

Bump the shared Rustwright version from 0.3.3 to 0.3.4 so we can tag v0.3.4 and attach CLI/MCP GitHub Release assets.

This release includes VP8 WebM page recording from #23 (GIF via .gif, MJPEG AVI via .avi).

Why

origin/main already has the recording work at 0.3.3. GitHub Release assets and install.sh follow the version tag, so a bump is required before publishing.

Testing

• python3 .claude/skills/version-upgrade/scripts/bump_version.py --check 0.3.4
• cargo check --locked
• cargo test --lib --locked (387 passed)
• cargo metadata --manifest-path cli/Cargo.toml --locked
• cargo metadata --manifest-path mcp/Cargo.toml --locked

Checklist

• I kept this change focused.
• I added or updated tests for behavior changes.
• I did not include private credentials, tokens, or internal-only artifacts.