docs(conceptual-design): clarify operators, algorithms, and product terminology

[knoepfel]

This PR incorporates follow-up changes from the 2025 CDR review and clarifies several aspects of the conceptual design:

• Clarifies the distinction between the logical containment of data products by data cells and their in-memory representation.
• Distinguishes user-defined algorithms from the higher-order-function operators registered and executed by Phlex.
• Updates registration, algorithm, and HOF documentation to use the terminology consistently.
• Renames “product name” to “product suffix” throughout the design.
• Corrects the fold-map example for calculating an arithmetic mean.
• Updates cross-references and related explanatory text.

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Resolves #74.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 18fec418-f92f-4acf-9da4-e9dd7a90ea71

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch post-review-updates

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