chore: Bump version to 0.1.4

- Fix: Skip empty/whitespace text content blocks
- Fix: Validate function call arguments and skip malformed calls
- Fix: Skip outputs for skipped function calls to maintain consistency
- Resolves Anthropic API errors:
  - "messages: text content blocks must contain non-whitespace text"
  - "Extra data: line 1 column 26 (char 25)" (invalid JSON)
  - "unexpected `tool_use_id` found in `tool_result` blocks"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

llmx-rs/Cargo.toml

@@ -43,7 +43,7 @@ members = [
 resolver = "2"
 
 [workspace.package]
-version = "0.1.3"
+version = "0.1.4"
 # Track the edition for all workspace crates in one place. Individual
 # crates can still override this value, but keeping it here means new
 # crates created with `cargo new -w ...` automatically inherit the 2024