Add /whatlang programming language & stack recommender

[Pdzly]

Interactive quiz that asks adaptive questions about goals, preferences, and constraints, then returns ranked recommendations with percentages, pros/cons, and links to learning resources.

Engine is pure TypeScript with zero Discord dependencies for future website reuse. Supports fast-track shortcuts, multi-select questions, scale questions, diversity bias for hobbyists, and integration with existing /learning resources.

[Pdzly]

@bristermitten the lint check fails because of out of this pr files FYI

[Copilot]

Pull request overview

Adds a new /whatlang interactive recommender that runs an adaptive quiz and returns ranked language/stack recommendations, integrating with existing learning resources while keeping the recommendation engine Discord-independent.

Changes:

• Introduces a pure TypeScript quiz/scoring engine (questions, targets, scoring, diversity bias) with Bun tests.
• Adds Discord command + interaction listener + renderers for quiz flow, results, sharing, and learning-resource selection.
• Registers the new module in the app module manager.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/modules/recommender/recommender.render.ts	Renders quiz questions, results, share embed, and learning-resources picker UI components.
src/modules/recommender/recommender.module.ts	Registers the recommender module and starts session cleanup on init.
src/modules/recommender/recommender.listener.ts	Handles button/select interactions, stores quiz sessions, and orchestrates quiz progression.
src/modules/recommender/recommender.command.ts	Implements /whatlang command to start an ephemeral quiz session.
src/modules/recommender/engine/types.ts	Defines quiz, question, and recommendation target/result types.
src/modules/recommender/engine/scoring.ts	Implements weight application, diversity bias, and result computation.
src/modules/recommender/engine/quiz.ts	Implements session state machine (next question, answer application, skip, completion).
src/modules/recommender/engine/index.ts	Re-exports engine public API and data.
src/modules/recommender/engine/engine.test.ts	Adds Bun tests for engine behavior and data validity.
src/modules/recommender/engine/data/languages.ts	Adds language recommendation targets with tags and resource links/IDs.
src/modules/recommender/engine/data/stacks.ts	Adds stack recommendation targets with components and resource links.
src/modules/recommender/engine/data/questions.ts	Adds quiz question set including fast-track, multi-select, and scale questions.
src/index.ts	Adds the new RecommenderModule to the module list.

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