docs: align MCP examples with tool schemas

[mstuart]

Summary

• replace unsupported MCP example arguments with calls that match effective handler behavior
• mirror corrected examples into the npm-published README
• prevent recent-file collection from dropping the newest file when same-second timestamps tie

Verification

• git diff --check
• cargo fmt --package code-memory -- --check
• flaky regression reproduced locally before the fix
• targeted regression passed 30 consecutive runs after the fix
• cargo test -q

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-30T23:09:36.164835Z	98c2466	New commits
🔒 Security Review	✅ Completed 2026-09-30T22:36:58.744477Z	9eeb70e	PR opened

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 9eeb70e512

ℹ️ About Codex in GitHub

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