fix(cli): veadk agentkit shows no subcommands on Typer ≥ 0.26

[yaozheng-fang]

Symptom

veadk agentkit --help lists no commands (only --help) in environments with a newer Typer — every re-exported AgentKit subcommand (build/config/deploy/runtime/…) disappears.

Root cause

cli_agentkit.py re-exports the AgentKit CLI's subcommands behind an isinstance gate:

agentkit_commands = get_command(agentkit_typer_app)
if isinstance(agentkit_commands, click.Group):   # ← False on Typer ≥ 0.26
    for cmd_name, cmd in agentkit_commands.commands.items():
        agentkit.add_command(cmd, name=cmd_name)

Since Typer 0.26 a TyperGroup is no longer a click.Group subclass, so the guard silently evaluates False and the loop never runs — the agentkit group ends up empty. It worked on Typer 0.21 (where the isinstance held) but breaks on 0.26.7. Unrelated to the recent harness changes; this was a latent bug the version bump exposed.

Fix

Drop the isinstance gate and iterate by duck-typing on .commands (always present on a TyperGroup):

for cmd_name, cmd in getattr(agentkit_commands, "commands", {}).items():
    agentkit.add_command(cmd, name=cmd_name)

Verification

• Typer 0.21.1: veadk agentkit lists all 13 commands (unchanged).
• Typer 0.26.7: the fixed logic now yields all 14 commands (was 0).
• ruff + pyright clean; full suite green (272 passed).

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