Fix stale project_id reference in deerflow-tenki README

[hveluxor]

Summary

• examples/deerflow-tenki/README.md had a stale "Scope" note referencing project_id, left over from before Tenki removed the account-level project layer.
• project_id no longer exists in the Tenki API/SDK — every other example in the cookbook already resolves sandboxes purely by workspace_id, and this example's own verify.py only ever sets workspace_id.
• Updated the note so it only talks about workspace resolution, matching the rest of the codebase.

Test plan

• Docs-only change; no code or tests affected.
• Confirmed project_id no longer appears anywhere else in the repo.

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Generated by Claude Code

[tenki-reviewer]

Review complete. No issues found — approved ✅.

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This PR updates the deerflow-tenki example README to correct the sandbox scope documentation. The previous text claimed the provider auto-resolves a project when the account has exactly one workspace and one project; the corrected text reflects that only the workspace is auto-resolved (when exactly one exists) and instructs users to set workspace_id explicitly otherwise. The change is documentation-only with no code impact.

Files	Change
examples/deerflow-tenki/README.md	Corrects the Scope paragraph to remove the project auto-resolution claim and the project_id guidance, aligning the docs with the provider's actual behavior.

_{Reviewed commit: 7bf849f}