docs(openspec): archive fpagent-install-upgrade and sync specs

Documents release pinning (--tag), the pinned-tag metadata route,
installed-version tracking with upgrade reporting, and restart of a
managed running service on upgrade; syncs the four requirements into the
fpagent-installer main spec.
This commit is contained in:
2026-10-02 11:41:50 +01:00
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schema: spec-driven
created: 2026-10-02