Add ADP-specific glossary terms for GA

[micheleRP]

Summary

Adds 10 new term partials to the canonical Redpanda glossary so the Agentic Data Plane (ADP) docs render glossterm: tooltips correctly at GA on 2026-06-15.

Closes the §3A R1 commitment in the ADP Docs Plan.

What's added

Term	Source of truth
tool	mcp_server.proto MCPTool
resource	MCP spec via mcp_server.proto
declarative agent	agent.proto Agent.managed.AgentManagedConfiguration
BYOA (bring your own agent)	agent.proto Agent.self_managed
OAuth Provider	oauth_provider.proto
OAuth Client	oauth_client.proto (RFC 005)
OAuth Connection	oauth_connection.proto
Token Vault	token_vault_admin.proto
spending event	spending_event.proto
Governance Dashboard	Governance V0 PRD + RFC 006

All entries use the existing Agentic Data Plane category. Hover text was drafted against the cited proto comments; lowercase concept terms (tool, resource, declarative agent, spending event) and proper-cased product nouns (OAuth Provider, Token Vault, Governance Dashboard) follow established glossary conventions.

Why these specifically

• tool / resource are already used as glossterm:tool[] / glossterm:resource[] across adp-docs MCP pages (mcp/test-tools.adoc, mcp/create-server.adoc, mcp/managed/managed-catalog.adoc, mcp/overview.adoc) but currently resolve to nothing. Bug fix.
• The other 8 are ADP GA terms with no entry yet. Without them, OAuth/Token Vault/Spending Event concepts ship at GA without definitions.

Deliberately deferred

• agent network — defer until Governance Dashboard V1 lands (post-GA).
• virtual provider / virtual model — hold until the AI Gateway routing redesign settles in protos under adp/v1alpha1/.
• guardrail — hold until the proto pivot (e0a1ba0cee / 7eff2ecbbf) is reflected in aigw/v1alpha1/.
• ACU, BYOM, Capacity-Based Hybrid — strategy/billing terms; not in proto and not surfaced in customer-facing UI/CLI at GA.

Test plan

• After merge, https://redpanda-agentic-data-plane.netlify.app/redpanda-adp/ resolves the new tooltips on existing glossterm:tool[] and glossterm:resource[] usages.
• No build warnings on the canonical glossary index at https://docs.redpanda.com/current/reference/glossary/.
• Companion adp-docs PR (replacing the glossary stub with an index page) opens against redpanda-data/adp-docs main after this PR lands.

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