v1.8.1

Features

• Claude Code plugin package: Added packages/claude-plugin with marketplace-ready plugin metadata and bundled Agent Skills (sdd and sdd-ui).
• Claude plugin documentation: Added dedicated setup and usage guide in docs/claude-code-plugin.md.

Fixes

• CR status semantics aligned: Updated CLI, docs, and skills to consistently treat sdd cr pending as pending-only (draft -> pending -> applied).
• Bug resolution guardrail: markBugResolved() now resolves only bugs in open state (draft bugs are no longer marked by mistake).
• VS Code explorer consistency: CR explorer now includes pending group, bug explorer includes draft group, and CR context action targets pending items.
• Prompt/remote-state test alignment: Updated core tests to match current prompt format and remote state schema.
• Claude plugin skill references: Aligned plugin skill wording with current CR/Bug lifecycle semantics.