* fix: handle release-age policy in global installs
* refactor: dedupe global policy-callback wiring
Collapse setupPolicyHandlers + createResolutionPolicyManifestUpdater into
one createGlobalPolicyCallbacks helper used by both global add and global
update entry points.
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Written by an agent (Claude Code, claude-opus-4-7).
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Co-authored-by: Zoltan Kochan <z@kochan.io>