docs(thermidor): add public facing abstractions ADR + annex

[fbeaudoincoveo]

https://coveord.atlassian.net/browse/KIT-5775

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[Copilot]

Pull request overview

Adds a new Thermidor ADR documenting the proposed public-facing abstractions (Engine, Interface, Controllers, Actions, and a composed-interface concept) and includes a diagram illustrating their relationships.

Changes:

• Added ADR-005 describing the rationale, requirements mapping, and option analysis for Thermidor’s consumer-facing abstractions.
• Added a Mermaid diagram asset intended to visualize abstraction relationships and cardinality.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/thermidor/docs/internal/adr/ADR-005-public-facing-abstractions.md	New ADR defining Thermidor’s public API abstractions and documenting tradeoffs/options.
packages/thermidor/docs/internal/adr/ADR-005-public-facing-abstractions.mermaid	Mermaid diagram source for the annex relationship visualization.

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commit: 924bb3b