When passing multiple `--add-dir` flags, the last silently overwrites instead of being combined

[Nemo157]

Describe the bug

When passing multiple --add-dir flags via claude_args, only the last value is used.

To Reproduce

Run a workflow like:

claude_args: |
  --add-dir "/path/to/dir-a"
  --add-dir "/path/to/dir-b"

Only dir-b ends up in the session's allowed directories.

Expected behavior

Both args are actually passed along.

API Provider

[x] Anthropic First-Party API (default)
[ ] AWS Bedrock
[ ] GCP Vertex

Additional context

Presumably just needs adding here:

claude-code-action/base-action/src/parse-sdk-options.ts

Lines 14 to 22 in 65f29cf

	// Flags that should accumulate multiple values instead of overwriting
	// Include both camelCase and hyphenated variants for CLI compatibility
	const ACCUMULATING_FLAGS = new Set([
	"allowedTools",
	"allowed-tools",
	"disallowedTools",
	"disallowed-tools",
	"mcp-config",
	]);