docs: append quick-reference directory map to ARCHITECTURE.md

[Rish-2006]

Description

Appends a concise, high-level directory reference summary map section to the architecture document to assist incoming contributors with rapid workspace navigation.

Related Issue

Closes #3242

Which package(s)?

docs

Summary by CodeRabbit

• Documentation
  • Added a quick directory map to the architecture documentation, clarifying the responsibilities of key workspace packages.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e1dc4a05-1cb9-45df-a8c6-bd297f3d3228

📥 Commits

Reviewing files that changed from the base of the PR and between 48f63a1 and 7a13f46.

📒 Files selected for processing (1)

• ARCHITECTURE.md

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📝 Walkthrough

Walkthrough

ARCHITECTURE.md adds a “Quick Directory Map” section linking major responsibilities to key packages/* directories.

Changes

Architecture documentation

Layer / File(s)	Summary
Quick directory map ARCHITECTURE.md	Adds package directory mappings for the core engine, widgets, UI controls, JSX runtime/hooks, and headless testing renderer.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: karanjot786

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description includes the summary, issue, and package, but omits required sections like Type of Change and Checklist.	Add the missing template sections, especially Type of Change, Checklist, GSSoC Participation, and Notes for the Reviewer.
Linked Issues check	❓ Inconclusive	The summary matches the layout guide request, but it doesn't confirm the required agent section.	Clarify whether the ARCHITECTURE.md map includes agents and helper testing folders, or share the full diff for verification.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise, specific, and accurately describes the documentation update.
Out of Scope Changes check	✅ Passed	Only ARCHITECTURE.md documentation was updated, matching the stated docs-only scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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