Add learn-by-doing interactive tools to the catalog (needs new learningResourceType)

[jt14den]

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Add a first batch of hands-on/interactive learning tools to the catalog, sourced from Learn-by-Doing Open Source Resources. One schema change is needed before any of these can be added honestly.

Schema change needed

learningResourceType currently has three actively-used values: workshop, course, guide (see docs/schema.md). None of them fit a game, wargame, or browser-based sandbox with no fixed duration and no instructor delivering it. Propose adding a new value, working name interactive tool, for genuinely hands-on/gamified practice environments. Open question: better name welcome (practice environment, sandbox, game?).

Recommended additions, first pass

Strong fits, propose adding now:

• Oh My Git! (game-based Git learning) — Version Control & Collaborative Development, Beginner
• Learn Git Branching (visual guided Git challenges) — Version Control & Collaborative Development, Beginner/Intermediate
• GitHub Skills (interactive courses inside real repos) — Version Control & Collaborative Development
• First Contributions (guided first-PR tutorial) — Version Control & Collaborative Development. Note: already referenced informally in your-first-web-contribution.json's description text, check for duplication before adding as its own entry
• Node.js First Contributions Guide (real PR walkthrough on a major production codebase) — Version Control & Collaborative Development
• Exercism (guided coding exercises with mentor feedback) — Software Design & Engineering Practices
• freeCodeCamp DevOps pipeline courses (build-along, free/nonprofit) — Reproducibility, Environments & Workflows
• picoCTF (free, CMU-backed CTF platform) — Security & Supply Chain
• OverTheWire: Bandit (shell/Linux wargame) — Security & Supply Chain

Good fits, confirm licensing/cost before adding:

• KodeKloud (800+ DevOps labs) — appears mostly paid/freemium, confirm free-tier scope
• TryHackMe (gamified security training) — freemium, confirm free-room coverage is substantial enough to list
• Linux Foundation: Open Source Management & Strategy — usually free-to-audit on edX, confirm current access model
• SadServers ("LeetCode for Linux") — confirm current pricing/free-tier
• KillerCoda — confirm current free/paid status post-Katacoda transition

Probably don't fit the catalog's lesson model, recommend skipping:

• explainshell, regex101 — reference micro-tools, no learning-objectives/duration structure; better as inline references within existing lessons than standalone catalog entries
• Class Central — Open Source — itself a course-aggregator; would duplicate what this catalog already does rather than being a teachable resource
• roadmap.sh DevOps — a curated link roadmap, same aggregator concern as Class Central
• swirl — good tool, but may fit better as a linked companion resource on the existing R lessons (r-packaging, julia-basics, intermediate-r) than a new standalone entry
• CHAOSS — already represented via 2 existing metrics lessons (metrics-model-starter-project-health, metrics-model-oss-project-viability-strategy); check whether there's a new specific CHAOSS course not yet covered before adding another entry

Also mentioned in the note, already well-covered in the catalog (no action needed): Open Source Guides, INTERSECT (source for 8 existing lessons), The Carpentries (source for 8 existing lessons).

Topic vocabulary note

Security & Supply Chain currently has only 1 lesson tagged (per the 2026-07-14 audit doc). Adding OverTheWire and picoCTF (and TryHackMe, pending the licensing check) is the most direct way to strengthen the thinnest topic in the current 13-term vocabulary, rather than adding a 14th topic.

Next step

Committee decision needed on:

1. The new learningResourceType value and its final name
2. Which "confirm licensing/cost" items are actually free/open enough to list
3. Whether skip-list items (explainshell, regex101, Class Central, roadmap.sh) belong elsewhere on the site as inline references, rather than not at all