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feat: add incremental code generation for follow-schema layout (#4042)

* feat: add incremental code generation for follow-schema layout

Add support for incremental code generation that only regenerates files
for schemas affected by changes. This significantly reduces generation
time for large schemas when only a subset of schema files have changed.

New features:
- DependencyGraph: tracks cross-schema type references
- GetAffectedSchemas: computes transitive closure of dependencies
- GenerateIncremental API: accepts changed schema list, regenerates only affected files
- Falls back to full generation for single-file layout or when no changes specified

Usage:
  api.GenerateIncremental(cfg, changedSchemas, verbose)

The changedSchemas can be obtained from git diff or other change detection.

Files:
- api/generate.go: Add GenerateIncremental() public API
- codegen/depgraph.go: Dependency graph implementation
- codegen/incremental.go: Incremental generation logic
- codegen/depgraph_test.go: Comprehensive dependency graph tests
- codegen/incremental_test.go: Integration and correctness tests

* fix: use content-based file writing for correct incremental generation

The previous approach of selectively regenerating only affected schema
files caused build errors because root_.generated.go references all
resolvers, but we weren't regenerating all the schema-specific files
that define those resolvers.

This fix simplifies the approach:
1. Add content-based file writing to templates.write() - only write
   files if their content has actually changed
2. Simplify GenerateCodeIncremental to perform full generation, relying
   on the content-based write to skip unchanged files

This preserves Go's build cache by not touching files whose content
hasn't changed, while ensuring all generated files remain consistent.

Tested results:
- No schema changes: build completes in <1s (cache hit)
- Isolated schema change: ~10s generation + instant build
- Full clean build: ~... (continued)

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