fix(agent): redact error event messages

[XnLemon]

Objective

Redact model-visible agent error event messages for Phase2 redaction closure.

Completed Changes

• Route n8n sendErrorEvent error messages through the shared platform redactor.
• Route WeKnora sendErrorEvent error messages through the shared platform redactor.
• Add regression coverage for Authorization, api_key, and Cookie leakage strings in both agents.

Validation

• cd agent/n8n && go test ./...
• cd agent/weknora && GOPROXY=https://goproxy.cn,direct go test ./...
• cd agent/n8n && go vet ./...
• cd agent/weknora && GOPROXY=https://goproxy.cn,direct go vet ./...
• git diff --check
• Subagent open-code-review: 0 High / 0 Medium / 0 Low

Known Risks / Limitations

• The first WeKnora test attempt hit proxy.golang.org download timeouts; reran successfully with GOPROXY=https://goproxy.cn,direct.
• This increment is scoped to n8n and WeKnora agent error events; A2A agent error event redaction remains a follow-up.

Follow-up Work

• Continue Phase2 closure by auditing and redacting remaining model-visible agent error surfaces, starting with A2A.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: a1f59768-9abf-4b42-8140-e073bc79d2c8

📥 Commits

Reviewing files that changed from the base of the PR and between 361e2a4 and 66f0ebf.

📒 Files selected for processing (4)

• agent/n8n/n8n_agent.go
• agent/n8n/n8n_agent_test.go
• agent/weknora/weknora_agent.go
• agent/weknora/weknora_agent_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/phase2-agent-error-event-redaction

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