Polish capability-panel copy for contributor comprehension

[RichardGeorgeDavis]

Summary

Improve Workspace Hub capability-panel copy so a first-time contributor can understand it without deep maintainer context.

Problem statement

The capability panel exposes useful workspace state, but terms such as reference-only, ability, and core service still assume too much prior context.

Affected area

• Workspace Hub capability panel copy
• Supporting docs where those terms are introduced

Expected outcome

Revise the panel wording so contributors can quickly understand:

• what each capability category means
• what is installed vs. reference-only
• what is safe to inspect vs. what is workspace-owned runtime functionality

Constraints or non-goals

• Keep the current capability model
• No backend schema changes unless clearly necessary
• Focus on copy, framing, and contributor comprehension

Verification

• Open the capability panel as a new reader
• Confirm the categories are understandable without reading deep architecture docs first
• Confirm docs remain consistent with the UI wording