Fix typos across lessons, add pedagogical review and repo docs

[Copilot]

Review of beginner courses (Box Model, CSS Selectors, Vanilla JS) for typos and pedagogical improvements per maintainer request.

Typo & bug fixes (17 fixes across 13 files)

• Incorrect JS property name: textValue → textContent in query1.md
• Silent student failure: removed errant semicolon inside string literal in query2.md ("drop-shadow(4px 4px 4px green);" → "drop-shadow(4px 4px 4px green)")
• Task count mismatch: "6 tasks" → "4 tasks" in CatBlog Polish capstone
• Broken markdown: unclosed code block in commas.ts, missing closing quote in commas.ts CSS comment
• Malformed HTML: <section> instead of </section> in borderChallenge.ts, wrong nesting order in inlineBlock.ts, double single-quote in pseudo.ts hiddenHTMLBefore
• Grammar/spelling: it's → its (2×), absolution → absolute, breath → breathe, even handler → event handler, So where as → Whereas, a the → the, duplicate it it → it
• CSS: double semicolon in centeringChallenge.ts

New files

• PROPOSED_REVISIONS.md — track-by-track pedagogical review with ~30 suggestions, structured into Framework Improvements (platform-level changes like vocab sidebar, learning objectives, intro screens) and Lesson-by-Lesson Suggestions (content tweaks per challenge). Acknowledges existing success animations and live visual feedback as strengths already built into the platform.
• AGENTS.md — coding conventions, file organization, challenge authoring patterns, quality checklist

Updated README.md

Replaced boilerplate Vite template text with project-specific content: track overview table, install/build/run instructions, project structure, guide for adding new challenges, and an open invitation for contributions.

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[thinkle-iacs]

The contribution can invite people to contribute -- doesn't need to be private 😀

Regarding your suggestions: there are already animations when students succeed and there is already instant visual feedback for each challenge built into the structure of the tutorials so you should update your suggestions to take this into account.

Final note: maybe break out suggested framework improvements separate from lesson by lesson suggestions

[Copilot]

The contribution can invite people to contribute -- doesn't need to be private 😀

Regarding your suggestions: there are already animations when students succeed and there is already instant visual ...

Addressed in a7e709d:

• Replaced "This project is private" with an open contribution invitation in README.md.
• Updated PROPOSED_REVISIONS.md to acknowledge the existing success animations and live visual feedback as strengths (not things to add).
• Restructured PROPOSED_REVISIONS.md into two clear sections: Framework Improvements (platform-level changes like vocab sidebar, learning objectives, intro screens) and Lesson-by-Lesson Suggestions (content tweaks per track/challenge).