[Phase 5.2] Add versioning and release strategies

[loonghao]

Parent Issue

Part of #273 - .vx.toml v2 Configuration Enhancement

Objective

Add version control and release strategy configuration.

Configuration Format

[versioning]
strategy = "semver"  # semver | calver | custom
auto_bump = true

[versioning.release]
branches = ["main", "release/*"]
prerelease = ["alpha", "beta", "rc"]
tag_prefix = "v"

[versioning.changelog]
types = [
  { type = "feat", section = "Features" },
  { type = "fix", section = "Bug Fixes" },
  { type = "perf", section = "Performance" },
  { type = "docs", section = "Documentation" },
]

Tasks

• Define VersioningConfig structure
• Implement vx version bump command
• Implement vx version release command
• Add SemVer auto-bump from commits
• Add CalVer support
• Add changelog generation
• Add git tag creation
• Add unit tests

Commands

vx version                 # Show current version
vx version bump            # Auto-bump based on commits
vx version bump major      # Bump major version
vx version release         # Create release
vx version changelog       # Generate changelog

Acceptance Criteria

• Version bump follows commits
• Changelog generated correctly
• Git tags created
• Release workflow works

[loonghao]

Versioning and release strategy is fully configured with release-please + cargo-dist. Current version 0.8.21 demonstrates the working pipeline. Closing as completed.