docs(TSP-1171): document real-time credit counter in Inventor interface

[claude]

Summary

• Adds a ### Credit usage in the Inventor sidebar subsection to the Option 1: Invent an Agent section in build/agents/create-an-agent.mdx, describing the real-time "X credits used" counter with coins icon, how it updates during AI interactions, and how it differs from the org-wide counter
• Adds a <Note> callout to both billing tabs in admin/subscriptions/plans.mdx (under the individual Agent-level monitoring section) pointing readers to the Inventor interface details

Test plan

• Verify the new subsection renders correctly under Option 1 on the Create an Agent page
• Verify the <Note> callouts appear in both the New billing and Old billing tabs on the Plans and credits page
• Verify all cross-reference links resolve correctly

Linear issue: https://linear.app/relevance/issue/TSP-1171/

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[linear]

TSP-1171 [Frontend] PR #13950: Credit usage counter in Inventor sidebar

[jordanc-relevanceai]

Consolidated into #607 as part of trimming the docs-drafter queue. Branch kept; PR can be reopened if needed.