Add Opera cache cleaner extension baseline

opera-cache-cleaner-extension/docs/agent-handoff.md

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+# Agent Handoff
+
+## Current State
+
+The Codex repository baseline has been applied to the local Opera Cache Cleaner extension.
+
+## Notes For Next Agent
+
+- The project is not currently a Git repository in this workspace.
+- Expected Gitea repository: `https://git.wilkensxl.de/Toxic/Opera-Extensions.git`.
+- The project has no package manager and no external dependencies.
+- Use syntax checks and manual Opera extension testing as the main verification path.
+
+## Open Items
+
+- Initialize or connect a Git repository if the project should be pushed to Gitea.
+- Confirm whether this extension should live at the repository root or inside `opera-cache-cleaner-extension/` before enabling package publishing or Gitea API polling.