P1: Do not override configured target mode with CLI default session

[vamgan]

Problem

The run command registers --target-mode with Commander default "session".

Relevant code:

• src/index.ts:83
• src/index.ts:212-214

Because Commander always supplies the default, runtime profile/default config target mode is ignored:

mode: options.targetMode ?? runtimeProfile?.target?.mode ?? config.defaults?.targetMode ?? "session"

A runtime profile with target.mode: "runtime" silently dispatches as session.

Suggested fix

Remove the Commander default:

.option("--target-mode <mode>", "Target mode")

Keep the fallback in createDispatchRequest().

Acceptance criteria

• Test where runtime profile has target.mode: "runtime" and no CLI --target-mode; request uses runtime.
• Explicit CLI --target-mode session still overrides config.