feat(parser): detect class-name expressions, parse .tres, resolve autoload singletons

[LeTuR]

Summary

Closes the rule-coverage gap where .gdcruiser.json rules only saw extends, preload(), and load(). Three S-tier detections so architectural rules natively cover everything that previously needed a separate pre-commit hook.

Class-name expressions in GDScript

• Typed annotations: var x: Foo, func f(c: Foo) -> Foo
• Generic params: Array[Foo], Dictionary[String, Foo]
• Type checks / casts: obj is Foo, obj as Foo
• Static / constant access: Foo.method(), Foo.CONST

Refs are resolved against the project symbol table; built-ins and unresolved identifiers are dropped to keep the graph clean. New CLASS_REF dependency type plus an expanded built-ins list (~250 entries).

.tres resource parsing

• script_class="..." from the [gd_resource] header registers the resource in the symbol table.
• Every [ext_resource path="res://..."] is captured — scripts become SCENE_SCRIPT edges, other resource refs become a new RESOURCE_REF edge — so rules now cover the data layer.
• Scanner walks *.tres; analyzer parses them after .tscn.

Autoload singletons (project.godot)

• Reads the [autoload] section and registers each identifier in the symbol table before class-ref resolution runs.
• TurnManager.advance(), EventBus.emit_signal(...), etc. then resolve via the same MEMBER_ACCESS pattern as any other class reference.
• Both *Identifier="*res://..." (enabled singleton) and bare entries are parsed; section-scoped so look-alike lines under other sections are ignored.
• References inside string literals and comments are sanitized away — explicit regression tests for both.

Ancillary

• DOT and Mermaid formatters got uses / resource edge labels.
• README updated with the new pattern table, .tres section, and autoload section.

Test plan

• uv run pytest — 140 tests pass (39 new)
• uv run ruff check . clean
• uv run ruff format --check . clean
• uv run gdcruiser tests/fixtures --no-cycles shows new class_ref edges (e.g. enemy.gd → player.gd from var target: Player) and heal_skill.tres in the graph
• uv run gdcruiser tests/fixtures/autoload_project --no-cycles resolves TurnManager.advance() and EventBus.something_happened to their backing scripts; in-string and in-comment references absent

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