feat: add proposal for profile validation mechanism

Create OpenSpec proposal to add profile validation before application generation.

- Add /validate-profile slash command to check profile completeness
- Detect placeholder patterns like [Your name], [Company], etc.
- Update CLAUDE.md to require validation before applications
- Define required vs optional sections
- Allow explicit validation skip with warning

Proposal validated and ready for implementation.

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

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

openspec/changes/add-profile-validation/specs/applicant-profile/spec.md

@@ -0,0 +1,65 @@
+# Applicant Profile
+
+## ADDED Requirements
+
+### Requirement: Profile Validation Command
+
+The system SHALL provide a `/validate-profile` slash command that verifies the profile is complete and ready for use.
+
+#### Scenario: Validation command is available
+
+- **WHEN** user is in a directory containing the framework
+- **THEN** they can run `/validate-profile` to check if `profile.md` is complete
+
+#### Scenario: Validation detects incomplete profile
+
+- **WHEN** `/validate-profile` is run and `profile.md` contains placeholder text patterns (e.g., `[Your name]`, `[Company]`)
+- **THEN** the command reports which sections contain placeholders and need completion
+
+#### Scenario: Validation confirms complete profile
+
+- **WHEN** `/validate-profile` is run and `profile.md` has no placeholder patterns in required fields
+- **THEN** the command reports that the profile is ready for application generation
+
+### Requirement: Placeholder Detection
+
+The validation SHALL detect common placeholder patterns indicating incomplete profile data.
+
+#### Scenario: Square bracket placeholders detected
+
+- **WHEN** profile contains text in the format `[placeholder text]`
+- **THEN** validation identifies these as incomplete fields
+
+#### Scenario: Required sections checked
+
+- **WHEN** validation runs
+- **THEN** it checks that Personal Information, Professional Summary, and at least one Work Experience entry are filled out (not placeholders)
+
+#### Scenario: Optional sections allowed to be empty
+
+- **WHEN** validation runs
+- **THEN** empty optional sections (Certifications, Projects) do not cause validation failure
+
+### Requirement: Automatic Validation Before Applications
+
+The `src/CLAUDE.md` instructions SHALL require Claude Code to validate the profile before generating any application documents.
+
+#### Scenario: Profile validated before CV generation
+
+- **WHEN** user requests CV generation
+- **THEN** Claude Code first validates `profile.md` is complete before proceeding
+
+#### Scenario: Profile validated before cover letter generation
+
+- **WHEN** user requests cover letter or application email generation
+- **THEN** Claude Code first validates `profile.md` is complete before proceeding
+
+#### Scenario: Validation failure blocks application generation
+
+- **WHEN** profile validation fails (incomplete data detected)
+- **THEN** Claude Code informs the user to complete the profile and does not generate application documents
+
+#### Scenario: User can skip validation explicitly
+
+- **WHEN** user explicitly requests to skip validation (e.g., "generate CV without validation" or "I know my profile is incomplete, proceed anyway")
+- **THEN** Claude Code can proceed with a warning about potential placeholder text in output