docs: start frontend mvp milestone

openspec/changes/frontend-mvp/specs/frontend-mvp/spec.md

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+# frontend-mvp Specification
+
+## ADDED Requirements
+
+### Requirement: Web app exposes the job-seeker tutoring loop
+
+The system SHALL provide a browser UI for the diagnostic interview loop.
+
+#### Scenario: user starts diagnostic practice
+
+- **GIVEN** a job seeker opens the web app
+- **WHEN** they enter target role, stack, and interview timeline
+- **THEN** the app creates a diagnostic session
+- **AND** shows role-relevant questions.
+
+#### Scenario: user submits an answer
+
+- **GIVEN** a diagnostic session is active
+- **WHEN** the user submits an answer
+- **THEN** the app shows typed grading feedback
+- **AND** the feedback links to evidence-backed learning state.
+
+### Requirement: Web app exposes learning progress
+
+The system SHALL show learner memory, readiness, and next challenge from the
+backend APIs.
+
+#### Scenario: progress appears after answer
+
+- **GIVEN** the user has submitted at least one answer
+- **WHEN** the app refreshes progress
+- **THEN** it shows concept mastery, readiness percentage, and next challenge.
+
+### Requirement: Web app exposes content operations
+
+The system SHALL provide MVP operator controls for material ingestion,
+ontology inspection, and teaching asset prompt candidates.
+
+#### Scenario: operator creates teaching asset prompt
+
+- **GIVEN** source material has produced ontology candidates
+- **WHEN** the operator generates an asset prompt for a concept
+- **THEN** the prompt shows source evidence, review state, model key, and model
+  verification guard.