feat: add Harsh's personalized journey submission

[harshjsh01]

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[harshjsh01]

Overview

This PR contains my full summer internship submission for the Personalized Journey (Antigravity) learning module. It introduces a completely new, narrative-driven way for users to learn core Python concepts (Variables, Conditionals, Loops, Lists, Functions) by focusing on the "Intuitive Way" philosophy.

Key Features Implemented:

• Rhizomatic Onboarding: A new onboarding flow where users select their favorite thematic universes (e.g., Space, Pets, Heroes) and self-assess their motivation on a sliding scale.
• The "95/5 Rule" UI: A 4-layer interactive React interface (Story -> Logic -> Code -> Reflection). It eliminates syntax friction by providing 95% of the boilerplate, asking the user to type only the 5% that proves conceptual mastery.
• Dynamic Story Interpolation Engine: A deterministic, 100% local text-generation engine that injects thematic vocabulary into master archetypes based on the user's chosen universe.
• Contradiction Engine: A background state machine that tracks a learner's conceptual beliefs and deliberately triggers "productive struggle" scenarios if a contradiction is detected.
• Domain-Driven Backend: Implemented a robust Express/Node.js backend utilizing the Repository Pattern, Service Layers, Domain Events, and a Unit of Work (UoW) transaction boundary.

Testing & Quality Assurance

• Developed comprehensive Unit and Integration tests using Jest and Supertest to harden the Unit of Work boundaries.
• Built UI integration tests using Vitest and React Testing Library.
• All tests are currently passing.

Documentation

• Added a full suite of documentation (located in the docs folder) detailing the architecture, state machines, and end-to-end user workflows.

I have placed all relevant files into the summership-26-prs/Harsh Joshi/ directory as required for the intern submission process. Looking forward to your review!