feat: implement profile validation mechanism

Add /validate-profile slash command and automatic validation before application generation.

Implementation:
- Created src/.claude/commands/validate-profile.md with validation logic
  - Detects placeholder patterns like [Your name], [Company], etc.
  - Checks required sections: Personal Info, Summary, Work Experience
  - Allows optional sections to be empty (Projects, Certifications)
  - Provides clear pass/fail feedback with actionable guidance
- Updated src/CLAUDE.md to require validation before applications
  - Added Profile Validation section with validation process
  - Integrated validation as step 0 in workflow
  - Documented explicit skip validation option with warning
  - Added /validate-profile to Available Commands
- All 15 tasks completed and validated

Implements: add-profile-validation

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

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

openspec/changes/add-profile-validation/tasks.md

@@ -2,27 +2,27 @@
 
 ## 1. Create Slash Command Structure
 
-- [ ] 1.1 Create `src/.claude/` directory
-- [ ] 1.2 Create `src/.claude/commands/` directory
+- [x] 1.1 Create `src/.claude/` directory
+- [x] 1.2 Create `src/.claude/commands/` directory
 
 ## 2. Implement Validation Slash Command
 
-- [ ] 2.1 Create `src/.claude/commands/validate-profile.md` with validation instructions
-- [ ] 2.2 Define validation rules for detecting placeholder patterns
-- [ ] 2.3 Specify required sections that must be complete (Personal Info, Summary, at least one Work Experience)
-- [ ] 2.4 Specify optional sections that can be empty
-- [ ] 2.5 Include clear output format for validation results (success or list of incomplete sections)
+- [x] 2.1 Create `src/.claude/commands/validate-profile.md` with validation instructions
+- [x] 2.2 Define validation rules for detecting placeholder patterns
+- [x] 2.3 Specify required sections that must be complete (Personal Info, Summary, at least one Work Experience)
+- [x] 2.4 Specify optional sections that can be empty
+- [x] 2.5 Include clear output format for validation results (success or list of incomplete sections)
 
 ## 3. Update Framework Instructions
 
-- [ ] 3.1 Update `src/CLAUDE.md` to add automatic validation requirement before application generation
-- [ ] 3.2 Add instructions for when to run `/validate-profile`
-- [ ] 3.3 Add guidance on handling validation failures
-- [ ] 3.4 Document the explicit skip validation option
+- [x] 3.1 Update `src/CLAUDE.md` to add automatic validation requirement before application generation
+- [x] 3.2 Add instructions for when to run `/validate-profile`
+- [x] 3.3 Add guidance on handling validation failures
+- [x] 3.4 Document the explicit skip validation option
 
 ## 4. Validation
 
-- [ ] 4.1 Verify `/validate-profile` command file is complete and well-documented
-- [ ] 4.2 Verify `src/CLAUDE.md` correctly requires validation before applications
-- [ ] 4.3 Test validation logic detects common placeholder patterns
-- [ ] 4.4 Ensure validation provides helpful feedback on incomplete sections
+- [x] 4.1 Verify `/validate-profile` command file is complete and well-documented
+- [x] 4.2 Verify `src/CLAUDE.md` correctly requires validation before applications
+- [x] 4.3 Test validation logic detects common placeholder patterns
+- [x] 4.4 Ensure validation provides helpful feedback on incomplete sections