- Capture full call stack + throw-site in the Squirrel runtime error hook
(new common/ScriptError.{h,cpp}) and surface it through ScriptException
(line/column/function/stackTrace/reported accessors).
- Runtime installs its own error hook and drives execute() with a raw
sq_call, fixing a null-deref when DevTool's hook replaces ssq's default
runtime error handler.
- Compile errors now carry source line/column plus a snippet with caret.
- REPL/MCP/Debugger eval paths return the real error text instead of
generic 'compile failed' / 'runtime failed'.
- Run() skips a second DevTool report for hook-reported script errors.
- ECS bootstrap compile/run failures are printed instead of swallowed.
Runtime now validates stackSize before constructing the Squirrel VM (previously the check ran after member initialization). DevTools singletons (AiPanel/ConsolePanel/McpServer/RenderVision) keep their process-immortal lifetime - required by the detached stdio reader thread and cross-singleton calls - but move from scattered raw new leaks to a single documented Immortal holder.
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