implement six-skill gstack 2 runtime

compat/pair-agent.md

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