Implement the initial framework skeleton

internal/profile/testdata/invalid_yaml.yaml

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+id: invalid-yaml
+version: 1.0.0
+templates:
+  - role: system
+    content: [unclosed bracket

internal/profile/testdata/missing_id.yaml

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+version: 1.0.0
+description: Missing ID
+templates:
+  - role: system
+    content: Hello
+output_format: text
+validation:
+  validation_mode: none

internal/profile/testdata/no_templates.yaml

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+id: no-templates
+version: 1.0.0
+templates: []
+output_format: text
+validation:
+  validation_mode: none

internal/profile/testdata/valid.yaml

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+id: test-profile
+version: 1.0.0
+description: A valid test profile
+expected_inputs:
+  - transcript
+  - glossary
+templates:
+  - role: system
+    content: You are a helpful assistant.
+  - role: user
+    content: Analyze this: {{.transcript}}
+model_defaults:
+  model: gpt-4o
+  temperature: 0.7
+output_format: markdown
+validation:
+  validation_mode: basic