docs: bootstrap tutor planning

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: `.planning/PROJECT.md` (updated 2026-04-26)
+
+**Core value:** The user should feel and prove that they are becoming more
+interview-ready after each short practice loop.
+
+**Current focus:** Phase 1: Go Backend Foundation and Workflow Boundary.
+
+## Current Decisions
+
+- Backend is Go.
+- `agent-farm-go` workflow patterns should be internalized behind typed backend
+  interfaces.
+- `third-one` is the LLM execution kernel.
+- Default runtime target is `deepseek-v4-flash`.
+- Source files should stay at or below 600 lines.
+- SOLID, KISS, and YAGNI are active implementation constraints.
+- OpenSpec is the intent/requirements source of truth.
+
+## Next Actions
+
+1. Choose first interview track and canonical concept seed list.
+2. Define typed contracts for diagnostic, grading, memory extraction, next
+   challenge, readiness update, ontology gap, and asset prompt.
+3. Plan Phase 1 with GSD before writing backend code.
+
+## Validation Log
+
+- 2026-04-26: `openspec validate bootstrap-job-tutor-platform --strict` passed
+  before GSD planning docs were created.
+
+---
+*State initialized: 2026-04-26.*