docs: plan backend foundation phase

openspec/changes/bootstrap-job-tutor-platform/specs/job-seeker-tutor/spec.md

@@ -15,6 +15,14 @@ while preserving an architecture that can later support general students.
 - **AND** grades the user's answers against explicit rubrics
 - **AND** creates an initial concept weakness map.
 
+#### Scenario: backend developer track is the first canonical track
+
+- **GIVEN** the MVP track catalog is initialized
+- **WHEN** the system loads the first interview track
+- **THEN** it provides the Backend Developer Interview track
+- **AND** includes HTTP, REST/API design, databases, transactions, caching,
+  concurrency, testing, and system design basics as seed concept clusters.
+
 #### Scenario: practice session adapts to weak answers
 
 - **GIVEN** a user answers an interview question weakly or incorrectly

openspec/changes/bootstrap-job-tutor-platform/specs/tutor-workflows/spec.md

@@ -23,6 +23,15 @@ The system SHALL express core tutor behavior as configurable workflows using
 - **THEN** it emits memory update candidates
 - **AND** each candidate identifies its evidence and confidence.
 
+#### Scenario: initial contract set is available for backend planning
+
+- **GIVEN** the backend workflow boundary is planned
+- **WHEN** implementation begins
+- **THEN** the initial contract set includes DiagnosticResult, GradedAnswer,
+  MemoryUpdateCandidate, NextChallenge, ReadinessUpdate, OntologyGap, and
+  TeachingAssetPrompt
+- **AND** each state-changing contract carries evidence references.
+
 ### Requirement: Default LLM runtime is configurable
 
 The system SHALL keep the LLM model target configurable while defaulting the