docs: update system architecture diagram

[freinold]

Summary by CodeRabbit

• Documentation
  • Updated system architecture diagram with clearer styling (thicker lines, smoother strokes) and refined layout.
  • Added new visual components, including an AI node with related shapes and labels.
  • Improved readability via adjusted positions, sizes, and connector styles (including dashed/dotted variants).
  • Standardized element bindings to enhance consistency across diagram elements.
  • General polish for better clarity in presentations and team communication.

[coderabbitai]

Walkthrough

Updates the Excalidraw system architecture diagram: normalizes boundElements from null to empty arrays, adjusts styling (stroke width, roughness), revises positions/sizes, updates metadata fields, and appends new ellipse/text elements including a labeled “AI” block.

Changes

Cohort / File(s)	Summary of Changes
Diagram styling and metadata updates docs/sketch/system_architecture.excalidraw	Replaced null boundElements with []; updated version/versionNonce/seed; increased strokeWidth to 4 and reduced roughness to 0; adjusted coordinates, sizes, and connector styles; added new ellipse and text elements, including an “AI” label; refreshed boundElement references and arrays.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I sketch with whiskers, ears held high,
New strokes grow bold, less rough, more spry.
Empty arrays where nulls once lay,
Ellipses hop into bright display.
“AI” now nests in the garden of nodes—
A tidy warren of interconnected roads.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title succinctly and accurately describes the primary change—updating the system architecture diagram in the documentation—without extraneous details, matching the changeset focused on visual diagram updates.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs-update-systemarch

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

docs/sketch/system_architecture.excalidraw (1)

5660-5894: Simplify overlapping AI circles

Both Ui0HT0jN-cPeBhAEWslkX and IkdzoAcAB2NNSuFC3viJF define identical ellipses (same position, size, colors, stroke). The later AI node has the same duplication (ehllFKcFX68M4wBqYSopf / zsHVGCcH-rjPbu-Sx5YnS). Keeping both layers doesn’t change the drawing but bloats the file and makes future edits harder (selecting the node grabs two shapes). Please drop the duplicates or differentiate them intentionally.

📜 Review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b5fe94c and 4b02636.

⛔ Files ignored due to path filters (1)

• docs/adr/system_architecture.png is excluded by !**/*.png

📒 Files selected for processing (1)

• docs/sketch/system_architecture.excalidraw (87 hunks)

[freinold]

@lenabMUC please review!