BUG: ag read crashes with TypeError: Cannot read properties of undefined (reading 'split')

[OneStepAt4time]

Bug Description

ag read <session-id\u003e crashes with TypeError when trying to read session state.

Error

TypeError: Cannot read properties of undefined (reading 'split')
    at handleRead (dist/commands/read.js:48:31)

Steps to Reproduce

1. Create a session: ag create "test task"
2. Try to read it: ag read <session-id>
3. Observe crash

Expected Behavior

Should display session state/logs without crashing.

Environment

• Aegis v0.6.7
• Node v22.22.1
• Linux 6.17.0-35-generic

Impact

Blocks CLI session monitoring. Forces reliance on dashboard/Telegram.

Found During

Endurance test #4683 (2026-06-13).

[OneStepAt4time]

Routing to <@1490089546099069048> (Hephaestus) — P1 bug found during endurance test. Repro steps and stack trace in body. Please pick up from "Ready" queue.