feat: Claude Code slash commands for Task Master (#774)

* Fix Cursor deeplink installation with copy-paste instructions (#723)

* fix: expand-task (#755)

* docs: Update o3 model price (#751)

* docs: Auto-update and format models.md

* docs: Auto-update and format models.md

* feat: Add Claude Code task master commands

Adds Task Master slash commands for Claude Code under /project:tm/ namespace

---------

Co-authored-by: Joe Danziger <joe@ticc.net>
Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>
Co-authored-by: Volodymyr Zahorniak <7808206+zahorniak@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: neno-is-ooo <204701868+neno-is-ooo@users.noreply.github.com>

.claude/commands/tm/add-subtask/index.md

@@ -0,0 +1,76 @@
+Add a subtask to a parent task.
+
+Arguments: $ARGUMENTS
+
+Parse arguments to create a new subtask or convert existing task.
+
+## Adding Subtasks
+
+Creates subtasks to break down complex parent tasks into manageable pieces.
+
+## Argument Parsing
+
+Flexible natural language:
+- "add subtask to 5: implement login form"
+- "break down 5 with: setup, implement, test"
+- "subtask for 5: handle edge cases"
+- "5: validate user input" → adds subtask to task 5
+
+## Execution Modes
+
+### 1. Create New Subtask
+```bash
+task-master add-subtask --parent=<id> --title="<title>" --description="<desc>"
+```
+
+### 2. Convert Existing Task
+```bash
+task-master add-subtask --parent=<id> --task-id=<existing-id>
+```
+
+## Smart Features
+
+1. **Automatic Subtask Generation**
+   - If title contains "and" or commas, create multiple
+   - Suggest common subtask patterns
+   - Inherit parent's context
+
+2. **Intelligent Defaults**
+   - Priority based on parent
+   - Appropriate time estimates
+   - Logical dependencies between subtasks
+
+3. **Validation**
+   - Check parent task complexity
+   - Warn if too many subtasks
+   - Ensure subtask makes sense
+
+## Creation Process
+
+1. Parse parent task context
+2. Generate subtask with ID like "5.1"
+3. Set appropriate defaults
+4. Link to parent task
+5. Update parent's time estimate
+
+## Example Flows
+
+```
+/project:tm/add-subtask to 5: implement user authentication
+→ Created subtask #5.1: "implement user authentication"
+→ Parent task #5 now has 1 subtask
+→ Suggested next subtasks: tests, documentation
+
+/project:tm/add-subtask 5: setup, implement, test
+→ Created 3 subtasks:
+  #5.1: setup
+  #5.2: implement  
+  #5.3: test
+```
+
+## Post-Creation
+
+- Show updated task hierarchy
+- Suggest logical next subtasks
+- Update complexity estimates
+- Recommend subtask order