Line 1482 referenced 'session_key' which is not defined until line 1519,
causing a NameError on every skill slash command invocation in the gateway
(e.g. /deploy, /plan-with-skill). The try/except silently swallowed the
error, making all user-defined skill slash commands silently fail.
The correct variable is '_quick_key', defined at line 1292 (same variable
used by the /plan handler on line 1379).
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