devkit avs call fails.

devkit avs call `--signature="(uint256,string)" args='(5,"hello")'`
```
Incorrect Usage: flag provided but not defined: -signature

NAME:
devkit avs call - Submits tasks to the local devnet, triggers off-chain execution, and aggregates results

USAGE:
devkit avs call [command options]

COMMANDS:
help, h Shows a list of commands or help for one command

OPTIONS:
--verbose, -v Enable verbose logging (default: false)
--enable-telemetry Enable telemetry collection on first run without prompting (default: false)
--disable-telemetry Disable telemetry collection on first run without prompting (default: false)
--help, -h show help
2025/07/16 14:04:58 flag provided but not defined: -signature
```
Also the autocomplete on zsh seems broken. When I type `devkit avs call --sig` and press tab, I get
```
devkit avs call --sigpanic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x30 pc=0x10501b3b8]

goroutine 1 [running]:
flag.(*FlagSet).Args(...)
/opt/homebrew/Cellar/go/1.24.2/libexec/src/flag/flag.go:741
github.com/urfave/cli/v2.(*Context).Args(...)
/Users/mm/go/pkg/mod/github.com/urfave/cli/v2@v2.27.6/context.go:167
github.com/urfave/cli/v2.checkCompletions(0x1063d8a00?)
/Users/mm/go/pkg/mod/github.com/urfave/cli/v2@v2.27.6/help.go:467 +0x28
github.com/urfave/cli/v2.(*Command).Run(0x1063d8a00, 0x140005cc840, {0x140005cafc0, 0x3, 0x3})
/Users/mm/go/pkg/mod/github.com/urfave/cli/v2@v2.27.6/command.go:160 +0xf0
github.com/urfave/cli/v2.(*Command).Run(0x1063da000, 0x140005cc700, {0x140005cc740, 0x4, 0x4})
/Users/mm/go/pkg/mod/github.com/urfave/cli/v2@v2.27.6/command.go:269 +0x828
github.com/urfave/cli/v2.(*Command).Run(0x140000fd1e0, 0x140005cc500, {0x140000322a0, 0x5, 0x6})
/Users/mm/go/pkg/mod/github.com/urfave/cli/v2@v2.27.6/command.go:269 +0x828
github.com/urfave/cli/v2.(*App).RunContext(0x140001ab000, {0x105ce9940, 0x140005d40a0}, {0x140000322a0, 0x6, 0x6})
/Users/mm/go/pkg/mod/github.com/urfave/cli/v2@v2.27.6/app.go:333 +0x51c
main.main()
/Users/mm/devkit-cli/cmd/devkit/main.go:63 +0x244
```

Commencez dans cmd/devkit/main.go, vers la ligne 63, et reproduisez l'appel avs et la commande de complétion zsh signalés. Suivez l'enregistrement de la commande avs call et le chemin de complétion indiqué dans la stack trace de urfave/cli ; le travail est terminé lorsque l'option signature est gérée et qu'appuyer sur tab après --sig ne provoque plus de panic.

Rédigé par le modèle d'indexation à partir du texte de l'issue.