Resolve runtime stack trace lines

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Summary

• Adds source-line symbolication on top of the existing libunwind stack walk.
• Uses atos on macOS and addr2line on Linux to populate run_stack_entry_t.file and line when debug info is available.
• Builds runtime C code with debug line tables and generates a dSYM before macOS runtime tests so line resolution works in the test binary.
• Tightens runtime/debug API tests to require nonzero line numbers for resolved frames.

Fixes #409

Validation

• zig fmt build.zig
• clang-format -i src/runtime/run_stacktrace.c src/runtime/run_stacktrace.h src/runtime/tests/test_runtime_api.c src/runtime/tests/test_debug_api.c
• zig build
• zig build test (passes; command prints the expected negative missing() diagnostic from the test fixture)
• zig build test-runtime

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	runlang	13fa610	Commit Preview URL Branch Preview URL	Apr 26 2026, 08:02 PM