fix(reconcile): avoid stable-state drift loops

[vanducng]

Summary

• compare grant agent/user lists as unordered sets
• treat MCP server headers as write-only so unobservable headers do not trigger every sync cycle
• keep blind-noop warnings for unobservable MCP fields

Verification

• go test ./...
• patched gcplane diff reports no drift for master, shtp, and annhien against live GoClaw

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dc627017-cf3d-4b68-ae16-e5820a3647d8

📥 Commits

Reviewing files that changed from the base of the PR and between c024ccb and 9df49ff.

📒 Files selected for processing (4)

• internal/manifest/field_config.go
• internal/reconciler/compare.go
• internal/reconciler/compare_test.go
• internal/reconciler/engine_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/reconcile-stable-drift

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