ci: pin doc-bridge advisory to 2.0.0

[EmersonBraun]

Pin the advisory Action to the 2.0.0 stable release commit. No other change.

[github-actions]

Doc Bridge advisory (Layer 1)

Repository: AgentsKit-io/agentskit-chat; PR: 209.
Base: dd41a3e; head: 55713a4; index source: ci-built.

Advisory only. Blocking gates are reported independently; interpretation and acceptance remain human-owned.

Findings: 0.
Pending: 0; updated-in-this-change: 0.

Pending

Updated in this change — confirm the update

Coverage gaps / policy exclusions: not-analyzed: 16; partial: 374.
Analysis ran under the service profile; full coverage detail is in the diff artifact.

Policy routing: excluded: 0; pending-version: 0; generator: 0; routed-to-L2: 0.
Historical, generated and ineligible version findings are summarized here; full details remain in the diff artifact. Changed references and migration context require review; no edits are proposed.