Release 0.30.0

[0.30.0] - 2026-09-06

Added

• Optional repository components in .metagit.yml (repos[].components[]): first-class semantic units with stable project/repo/component identity, catalog mapping of application paths[], and validation via metagit config validate. See docs/concepts/components.md.

Changed

• Bump gitpython to >=3.1.59 (PYSEC-2026-3785–3788).
• Bump mkdocs-material to >=9.7.7 (CVE-2026-73295).

Full Changelog: 0.29.2...0.30.0