refactor: Standardize command naming conventions and remove parent relationships

Updates all command files to use consistent naming without parent field:
- Remove parent field from all command frontmatter
- Standardize name field to use simple names instead of prefixed names
- Fix usage patterns for brainstorm commands to use proper workflow namespace
- Add new medium-project-update.sh script for batch updates

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/task/breakdown.md

@@ -1,5 +1,5 @@
 ---
-name: task-breakdown
+name: breakdown
 description: Intelligent task decomposition with context-aware subtask generation
 usage: /task:breakdown <task-id>
 argument-hint: task-id

.claude/commands/task/create.md

@@ -1,5 +1,5 @@
 ---
-name: task-create
+name: create
 description: Create implementation tasks with automatic context awareness
 usage: /task:create "title"
 argument-hint: "task title"

.claude/commands/task/execute.md

@@ -1,5 +1,5 @@
 ---
-name: task-execute
+name: execute
 description: Execute tasks with appropriate agents and context-aware orchestration
 usage: /task:execute <task-id>
 argument-hint: task-id

.claude/commands/task/replan.md

@@ -1,5 +1,5 @@
 ---
-name: task-replan
+name: replan
 description: Replan individual tasks with detailed user input and change tracking
 usage: /task:replan <task-id> [input]
 argument-hint: task-id ["text"|file.md|ISS-001]