Add interactive command graph to docs

[Markus Herdieckerhoff (markusherdi)]

Summary

• Adds docs/command-graph.html, an interactive, searchable visualization of every content-cli command (grouped by area, with descriptions/options shown on click).
• Links to it from the README's new "Command Graph" section via raw.githack.com, so it renders live in the browser without needing to be downloaded.
• Documents in docs/how-to-add-command.md that the graph must be updated manually whenever commands are added, removed, renamed, or changed.
• Removes the stale Agentic Development link (docs/user-guide/agentic-development-guide.md) from mkdocs.yaml and docs/user-guide/index.md — the file was deleted in SP-880: remove asset-registry-endpoints agent skill #380 but the links were never cleaned up.

Test plan

• Merge and confirm https://raw.githack.com/celonis/content-cli/main/docs/command-graph.html renders the interactive graph
• Click through a few nodes in the graph to confirm descriptions/options show correctly in the sidebar

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Note

Low Risk
Documentation-only changes with no runtime or CLI behavior impact; the main follow-up risk is the graph drifting from the real command tree if contributors skip manual updates.

Overview
Adds docs/command-graph.html, a static, hand-maintained vis-network page that maps the full content-cli tree (search, sidebar details/options, deprecated styling) and documents the same surface area as the CLI help text.

The README gains a Command Graph section and TOC entry, linking the live view via raw.githack.com and pointing contributors to how-to-add-command.md for keeping NODES / EDGES in sync when commands change.

how-to-add-command.md now requires updating the graph in the same PR as command changes.

Removes the broken Agentic Development entry from mkdocs.yaml and docs/user-guide/index.md after the guide file was removed earlier.

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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