README: Add deployed AWS architecture diagram

[alanmaizon]

• Replace the README Execution Status block with a Mermaid diagram of the deployed AWS architecture (CloudFront -> ALB -> ECS frontend/backend; backend -> RDS/S3/Bedrock).
• Stop docs sync (scripts/sync_docs.py) from requiring/updating a README status block; tests updated accordingly.

Summary by Sourcery

Document the deployed AWS architecture in the README and stop treating the README as a synced status document.

Documentation:

• Replace the README execution status section with a Mermaid diagram describing the deployed AWS architecture, including CloudFront, ALB, ECS services, RDS, S3, Secrets Manager, and Bedrock.

Tests:

• Update sync_docs tests to no longer seed or assert on README status blocks, focusing checks on DEVELOPMENT_PLAN and AWS alignment docs.

Chores:

• Remove README.md from the list of documentation files managed by scripts/sync_docs.py so its status block is no longer auto-generated or required.

[sourcery-ai]

Reviewer's Guide

Replaces the README execution status section with a Mermaid-based AWS deployment architecture diagram and removes README from the docs sync pipeline so sync_docs.py and its tests now only manage the wiki-based status sections.

File-Level Changes

Change	Details	Files
Document the deployed AWS architecture in the README using a Mermaid diagram instead of an auto-generated execution status block.	Update stack description to distinguish local development storage from production storage and clarify Bedrock model usage. Remove the auto-generated Execution Status section and its placeholder markers from the README. Add a Mermaid flowchart diagram showing CloudFront -> ALB -> ECS Fargate services, backend dependencies on RDS/S3/Bedrock/Secrets Manager, and logging via CloudWatch.	README.md
Stop the docs sync script from reading/writing README status blocks and adjust tests to only track wiki docs freshness.	Remove README.md from the list of sync targets in the docs sync main routine so it no longer renders or updates README status content. Adjust test repository seeding helper to no longer render or write README status markers. Update stale-docs failure expectations to only reference the wiki documents (development plan and AWS alignment).	backend/tests/test_sync_docs.py scripts/sync_docs.py

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[sourcery-ai]

Hey - I've left some high level feedback:

• The list of sync targets (README/PLAN/AWS) is now partially duplicated between scripts/sync_docs.py and backend/tests/test_sync_docs.py; consider centralizing the targets in one place (or a small helper) so future changes don’t need to be kept in sync manually.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The list of sync targets (README/PLAN/AWS) is now partially duplicated between `scripts/sync_docs.py` and `backend/tests/test_sync_docs.py`; consider centralizing the targets in one place (or a small helper) so future changes don’t need to be kept in sync manually.

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