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Node 26.0.0 removed --experimental-transform-types, so the native source-launch chain cannot start anywhere on that line, and strip-only mode rejects the vendored syntax (parameter properties, decorators, runtime enums/namespaces). Switch bin/dsh, the root dsh/demo:tui/ demo:web scripts, and the Code Mode TUI overlay to node --import tsx/esm: one launch vector across the whole engines range, ~0.4s faster than the full tsx default (the CJS hook stays off; the graph is ESM-only). Delete scripts/tspath-loader.ts and apps/cli/src/tsconfig-paths-loader.ts: tsx owns both transformation and tsconfig paths projection. Add dsh-source-launch-smoke to the node-compat gates so the 22.19/26 matrix executes the real launch vector; no CI job did, which is how the Node 26 breakage shipped silently. Supersedes the native-TypeScript-source-launch Agent Note (new note records the profiling evidence and rejected alternatives).