feat: remove args node type and clean up related resources

[handlename]

Description

Removed the deprecated args node type from the Obsidian Canvas workflow execution plugin "Runestone".

Warning

⚠️ Breaking Change
This release deprecates and completely removes the args node type (runestone.type: args).
Workflows containing args nodes will fail pre-execution validation. Please refer to MIGRATION.md for steps on migrating your workflows to script-based parameter nodes or inline variables.
Note: For backward compatibility, the executor still injects an empty object {} for the args parameter in scripts/templates to avoid immediate runtime ReferenceErrors.

Motivation

With the introduction of the explicit start node marker, the entry points of workflows are now clearly defined. As a result, the args node—which was originally introduced to avoid ambiguity when multiple entry nodes existed—is no longer necessary and has been deprecated.

Key Changes

• Types, Parser, Validator, & Executor:
  • Removed "args" from RunestoneNodeType.
  • Cleaned up args-specific graph validation rules (such as block requirements and edge constraints) and parsing logic.
  • Removed concurrent execution setup, merging, anyArgsEdgeDismissed checking, and warning logs for the args node from the execution engine.
• Backward Compatibility:
  • To prevent breaking changes for existing scripts that reference args variables or templating like {{args.key}}, the executor still injects an empty object {} for the args parameter, avoiding runtime errors like ReferenceError.
• Test Suite Updates:
  • Removed args-specific test cases and updated makeNode helpers in executor.test.ts and validator.test.ts.
• Documentation Updates:
  • Removed references to the args node from AGENTS.md, REQUIREMENTS.md, GLOSSARY.md, and README.md.
  • Added a migration guide for the args node deprecation in MIGRATION.md (v0.4 section).
• Skill Definition & Example Vault:
  • Removed args node references in Claude Code skill definition (SKILL.md) and removed args-node.md templates.
  • Cleaned up the example vault (vault.example) by deleting the args-exec-example and refactoring para-note workflow to pass parameters using the upstream config node via the input array rather than the deprecated args node.

Verification Results

• All 154 unit tests pass successfully.
• npm run lint completes with no errors or warnings.