implement six-skill gstack 2 runtime

compat/plan-tune.md

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