Fix args variable in parameter-less custom commands

[ColumbusLabs]

Description

Fixes #1035.

Custom commands without declared parameters now receive the aggregate {{args}} variable, matching commands that do declare parameters. The regression test covers a parameter-less command invoked with multiple arguments.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Changeset

• Added a changeset (pnpm changeset) describing this change for the changelog

Testing

Automated Tests

• Regression coverage added in executor.spec.ts
• All existing tests pass (pnpm run test:all — 6,712 passed, 1 skipped)
• Focused executor tests pass (18 passed)

Manual Testing

• Tested with Ollama (not applicable)
• Tested with OpenRouter (not applicable)
• Tested with OpenAI-compatible API (not applicable)
• Tested MCP integration (not applicable)

Checklist

• If this was for an open issue, I was assigned to it (I posted a claim on the unassigned issue before starting)
• Code follows project style guidelines
• Self-review completed
• Documentation updated (not needed; changeset included)
• No breaking changes
• Appropriate logging added (not applicable; no new runtime event)

Additional checks: TypeScript typecheck, Biome formatting/lint, build, Knip, and dependency audit all passed. The repository gate skipped Semgrep because it was unavailable locally.

[will-lamerton]

Thanks for this PR @ColumbusLabs - feel free to add yourself as a contributor to our website via a PR which I will approve :)

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