fix(sse): preserve tools echo on response.completed lifecycle event (…

[SofDev007]

…#8990)

stripResponsesLifecycleEcho stripped tools from all three Responses lifecycle events. response.completed is the terminal snapshot Codex CLI rebuilds its tool list from, so stripping it left the client with zero tools. Scope the tools deletion to response.created/in_progress only, mirroring the response.completed special-case already used by backfillResponsesCompletedOutput. instructions stripping (the >100KB size lever, not reported broken) is unchanged on all three events.

Fixes #8990

Summary

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Validation

Run only the focused loop for what you changed — the full unit suite, Vitest, the
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