implement six-skill gstack 2 runtime

compat/careful.md

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+<!-- GENERATED by scripts/gstack2/generate-skill-tree.ts; do not edit. -->
+# Compatibility alias: /careful
+
+This is not a public/discoverable skill. Route the legacy invocation to `$debug --mode Diagnose-only --module careful`, then read [the preserved module](../skills/debug/references/legacy/careful.md) in full.
+
+- Tree: `debug`
+- Public mode: `Diagnose-only`
+- Legacy internal alias: `careful`
+- Dispatcher role: `internal`
+- Mandatory specialist input: `false`