Add workflow event inspection for agent diagnostics

[ANcpLua]

Summary

• Add the model-visible, read-only inspect_workflow_events tool.
• Return immutable journal summaries and retrieve protected content only when a model supplies content_ref.
• Avoid implicit graph retrieval for the diagnostic read path.
• Document the end-to-end snapshot flow concisely in server/README.md.

Related implementation

• Add agent diagnostic snapshot capture qyl#550
• Add agent diagnostic snapshot contract qyl-api-schema#20

Validation

• Server verification and build passed.
• Server tests: 68/68.
• Tool manifest and README surface checks passed.

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[ANcpLua]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: c6c03eec02

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