fix(registry): handle v-prefixed and dirty git versions in version checks

[pocky]

Summary

• Fix version constraint checks failing for CLI binaries built from git tags (v0.8.1) or intermediate commits (v0.8.1-3-gabcdef-dirty) — these are valid states during development but were rejected by the version parser
• ParseVersion now strips a leading v prefix before parsing, aligning with the common convention that git tags use v-prefixed semver
• effectiveCLIVersion falls back to 999.0.0 for any unparseable version string (e.g. git describe output with commit distance and hash), preventing plugin/pack version checks from hard-failing on dirty dev builds

Changes

Version Parsing

• pkg/registry/version.go: Strip leading v prefix in ParseVersion before regex match; update doc comment to reflect accepted formats
• pkg/registry/version_test.go: Add ParseVersion cases for v-prefixed plain, prerelease, and complex prerelease versions; add CheckVersionConstraint cases for v-prefixed and dirty versions

CLI Version Handling

• internal/interfaces/cli/workflow_cmd.go: Extend effectiveCLIVersion to fall back to 999.0.0 when ParseVersion fails (covers git describe output like v0.8.1-3-gabcdef-dirty)
• internal/interfaces/cli/workflow_cmd_test.go: Add test cases for v-prefixed, v-prefixed dirty, and git describe-style version strings

Test Fixtures

• internal/infrastructure/workflowpkg/manifest_test.go: Remove the v-prefixed invalid version test case — v1.0.0 is now a valid input
• tests/integration/features/execution_order_determinism_test.go: Fix whitespace alignment in a test case struct literal

Test plan

• make test passes with no failures, including updated TestParseVersion, TestCheckVersionConstraint, and TestEffectiveCLIVersion_DevPrefix
• Build a binary from a v-tagged commit and confirm plugin/pack version checks succeed: awf run <workflow>
• Simulate a dirty intermediate build by setting Version = "v0.8.1-3-gabcdef-dirty" and confirm effectiveCLIVersion() returns 999.0.0
• make lint passes with zero violations

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