Test installed Codex hooks through queue persistence

[teamleaderleo]

Summary

Adds regression coverage for #13489 across the source seam that was previously split between separate tests.

The test now exercises:

1. cmux hooks codex install --yes
2. the generated persistent SessionStart / UserPromptSubmit shell commands
3. the real bundled CLI's hooks enqueue codex ... admission path
4. PID-based agent.resolve_delivery_target route snapshotting
5. AgentHookDeliveryQueue + AgentHookDeliveryProcess replay
6. persistence into codex-hook-sessions.json

It asserts the persisted session keeps the expected session id, workspace id, surface id, PID, running state, and prompt turn.

Why

The product fix already landed in #8537 (fbcdd8dc71d6dbbff0e46c9d82b3ed7e7c66bfa4). Existing coverage verifies the installed shell reaches queue admission, and separate tests verify the direct Codex handler persists sessions. There was no regression joining those two halves, which is the exact boundary implicated by #13489.

This PR is test-only; no product behavior changes.

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Summary by cubic

Adds regression coverage for #13489 by joining the two previously split test halves into one end-to-end test.

• Installs the Codex hooks, replays the generated SessionStart and UserPromptSubmit commands through the real bundled CLI admission path and delivery queue, and asserts the persisted codex-hook-sessions.json record keeps session ID, workspace ID, surface ID, PID, running state, and prompt turn.
• Test-only; no product behavior changes.

^{Written for commit 0464f23. Summary will update on new commits.}

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• cmuxTests/AgentHookDeliveryQueueTests.swift

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