Add composable issue validators to internal/validation package: - IssueValidator type with Chain() composition function - Exists(), NotTemplate(), NotPinned(), NotClosed(), NotHooked() validators - HasStatus(), HasType() for checking allowed values - ForUpdate(), ForClose(), ForDelete(), ForReopen() convenience chains Update cmd/bd/show_unit_helpers.go to use centralized validators instead of duplicated inline validation logic. This enables consistent validation across all commands with a single source of truth. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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