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build: add amalgamation support via rake amalgam task

Add ability to generate combined mruby.h and mruby.c files for single-file embedding, similar to SQLite's amalgamation. Usage: rake amalgam Output: build/<target>/amalgam/mruby.{h,c} Features: - Headers concatenated in dependency order with guards stripped - Sources concatenated with proper ordering (core, gems, mrblib) - X-macro headers (ops.h) inlined at each include point - Local includes automatically inlined - Handles both src/ and core/ gem directory conventions Co-authored-by: Claude <noreply@anthropic.com>

3 files changed

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lib/mruby
tasks

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Original file line number	Diff line number	Diff line change
`@@ -37,6 +37,7 @@ load "#{MRUBY_ROOT}/tasks/test.rake"`
`37`	`37`	`load "#{MRUBY_ROOT}/tasks/benchmark.rake"`
`38`	`38`	`load "#{MRUBY_ROOT}/tasks/doc.rake"`
`39`	`39`	`load "#{MRUBY_ROOT}/tasks/install.rake"`
	`40`	`+load "#{MRUBY_ROOT}/tasks/amalgam.rake"`
`40`	`41`
`41`	`42`	`##############################`
`42`	`43`	`# generic build targets, rules`