feat: add category and scope to specs for enhanced filtering and organization

- Introduced SpecCategory and SpecScope types to categorize specs by workflow stage and scope (global/project).
- Updated Spec interface to include category and scope properties.
- Enhanced SpecCard component to display category and scope badges.
- Implemented category and scope filtering in SpecsSettingsPage.
- Updated localization files to support new category and scope labels.
- Modified spec loading commands to utilize category instead of keywords.
- Adjusted spec index builder to handle category and scope during spec parsing.
- Updated seed documents to include category information.

.claude/skills/workflow-plan/phases/02-context-gathering.md

@@ -203,7 +203,7 @@ This is the PRIMARY context source - all subsequent analysis must align with use
 Execute complete context-search-agent workflow (Phase 1-3) for implementation planning.
 
 Key emphasis:
-- Run: ccw spec load --keywords exploration FIRST (per your spec Phase 1.1b)
+- Run: ccw spec load --category exploration FIRST (per your spec Phase 1.1b)
 - Synthesize exploration results with project context
 - Generate prioritized_context with user_intent alignment
 - Apply specs/*.md constraints during conflict detection

.claude/skills/workflow-plan/phases/04-task-generation.md

@@ -171,7 +171,7 @@ Session ID: ${sessionId}
 MCP Capabilities: {exa_code, exa_web, code_index}
 
 ## PROJECT CONTEXT (MANDATORY - load via ccw spec)
-Execute: ccw spec load --keywords planning
+Execute: ccw spec load --category planning
 
 This loads:
 - Technology stack, architecture, key components, build system, test framework