Release v0.1.4: support unquoted multi-word subgraph titles

[cmwright]

Summary

Fixes a parse failure on subgraph titles written without quotes or brackets, e.g. subgraph Workflow Engine, which Mermaid accepts. The grammar previously matched only the first identifier (Workflow) and then failed on the remaining words.

flowchart LR
    AT --> WE
    subgraph Workflow Engine
        WE[Event consumer] --> SUB{Match}
    end

Changes

• Grammar: add an unquoted-label alternative to subgraph_header, ordered after the explicit id[label] / quoted forms and after a bare single-token id (preserved via a &NEWLINE lookahead so a lone identifier stays a referenceable id). An unquoted multi-word title generates a synthetic id, matching existing quoted-only behavior.
• Parser: handle the new subgraph_unquoted_label rule.
• Release: bump workspace crates to v0.1.4 and update inter-crate dependency pins.

Tests

• Added test_parse_subgraph_with_unquoted_multiword_label and test_parse_subgraph_bare_id_still_has_no_label.
• Full workspace test suite passes.

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