feat: v1.6.2 release

[cody-rester]

Description

Version 1.6.2 release. Adds an HTML-based Architecture Overview collector, splits the User Guide into two parts, and adds a Prerequisites Checklist guide.

Type of Change

• New feature
• Documentation

Changes Made

• HTML Architecture Overview collector — opens architecture-form.html in the user's browser, waits for the JSON export, then imports it automatically; falls back to CLI prompts if the user
  opts out or the file cannot be found
• manual_input_mode config field ("html" default / "cli") to control which architecture collector mode is used
• Architecture form bundled in platform_atlas/guides/ and auto-synced to ~/.atlas/ on first use (stale copies replaced using size + SHA-256 comparison)
• Architecture capture now reuses existing ~/.atlas/architecture.json without re-prompting when a completed collection is already present
• PROJECT_GUIDES path constant added to core/paths.py
• Split USER-GUIDE.md into USER-GUIDE-INSTALLATION-AND-USAGE.md and USER-GUIDE-READING-THE-REPORT.md
• Added PREREQUISITES-CHECKLIST.md and corresponding HTML version
• Added HTML user guide renderings for all three guides
• Sample report (no logs) added to GUIDES/HTML/ for documentation reference

Testing

• HTML architecture form tested locally — browser opens, JSON export detected and imported successfully
• CLI fallback tested — typing cli at the prompt correctly drops through to terminal questions
• Architecture data reuse tested — existing ~/.atlas/architecture.json skips re-collection
• manual_input_mode cli config override tested

Checklist

• Code follows the project's style guidelines
• Self-review of code has been performed
• Code has been commented where necessary
• Tested with make setup or relevant profile
• Commits follow conventional format (type: subject)
• No secrets or credentials committed
• Documentation has been updated accordingly
• PR has been labeled appropriately