fix(agents): repoint Pi's token-gate comment after the rebase

Rebasing #211 onto #240 moved the session-id token gate out of
resume_command and into the shared session_command_flags helper, so
Pi's comment pointing at "the token gate above" no longer names
anything. Comment only; the gate itself is unchanged.

crates/tty7-core/src/core/cli_agent.rs

@@ -204,7 +204,8 @@ impl CLIAgent {
             // session picker and `--continue`/`-c` just takes the newest
             // session; the flag that targets one by id is `--session
             // <path|id>` ("Use specific session file or partial UUID"). Its
-            // ids are uuidv7, so they clear the token gate above.
+            // ids are uuidv7, so they clear `session_command_flags`' token
+            // gate.
             CLIAgent::Pi => Some(format!("pi{flags} --session {session_id}")),
             _ => None,
         }