[docs/diagram] Inventory all existing diagrams across the repository

[mesutoezdil]

Context

This issue is part of the HAMi v2.9.0 Documentation Revamp Plan (WS4 - Architecture Diagram Redesign).

Before any diagrams are redrawn, we need a clear picture of what exists today: where diagrams live, what format they are in, and which ones are outdated or inconsistent.

The final diagram set must meet these requirements (keep them in mind during the inventory):

• Clear separation of control plane and data plane
• Exported as SVG with editable source files (draw.io or OmniGraffle)
• Minimal text inside diagrams
• Reusable visual components across diagrams

Before you start

Please reach out to the maintainers before picking this up:

• @rootsongjc (author, architecture decisions)
• @mesutoezdil (revamp reviewer, scope alignment)

Scope

Produce a single markdown file docs/diagrams-inventory.md (or open a follow-up comment on this issue) that lists:

• Every diagram in the repository (images, mermaid blocks, inline ASCII art)
• File path and the document it appears in
• Current format (PNG, SVG, Mermaid, ASCII)
• A short note on whether it is current, outdated, or unclear
• Whether an editable source file exists
• Whether it correctly separates control plane from data plane (where applicable)

Acceptance criteria

• All diagrams across docs/, blog/, i18n/, versioned_docs/, and static/ are covered
• Each entry has: path, format, status (current / outdated / unknown), source file availability, and control/data plane separation status
• The output is readable as a plain markdown table or list
• The inventory is detailed enough to plan the redraw work in the follow-up issue

Notes

• This is a research and audit task, no drawing required
• The output of this issue will be used to open and plan the WS4 diagram redraw issue
• DCO sign-off required on every commit (git commit -s)