docs: add Mermaid dependency diagrams to README

[Copilot]

Adds a Dependency Diagrams section to the README with one Mermaid flowchart per reusable workflow, visualising the full workflow → jobs → actions chain and calling out f2calv-owned actions with a blue highlight.

Structure

• Each diagram uses flowchart LR with three tiers: workflow entry node (stadium shape) → job nodes → action/sub-workflow nodes
• classDef f2calv fill:#dbeafe,stroke:#2563eb,color:#1e3a5f applied to all f2calv/* actions and reusable workflow calls
• Reusable sub-workflow calls rendered with Mermaid's subprocess shape ([[...]]) to distinguish them from step-level actions

Notable: _dotnet-publish-nuget

The most complex workflow — surfaces inter-job needs edges and two calls to _gha-release-versioning (both highlighted as f2calv-owned):

flowchart LR
    classDef f2calv fill:#dbeafe,stroke:#2563eb,color:#1e3a5f
    W(["_dotnet-publish-nuget"]) --> J1["versioning"]
    W --> J2["build"]
    W --> J3["release"]
    J1 -- uses --> SW1[["_gha-release-versioning"]]
    J2 -- needs --> J1
    J2 --> A1["f2calv/gha-dotnet-nuget@v2"]
    J3 -- needs --> J1
    J3 -- needs --> J2
    J3 -- uses --> SW2[["_gha-release-versioning"]]
    class A1 f2calv
    class SW1 f2calv
    class SW2 f2calv

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Original prompt

please update the readme with mermaid diagrams showing the dependency chain of actions per workflow, highliting actions from the f2calv owner

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