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Child of PAR-190. Today a release snapshots whatever is in a project's "Pending Release" status (implicit). Add explicit tag/untag of an individual issue to a release.
Scope:
release_issue membership row for an issue outside the auto-snapshot (respecting RBAC settings.manage); keep the snapshot path.
Verified LIVE.
ReleaseService.addIssue/removeIssueprovide explicit tag/untag outside the auto-snapshot (frozen-release guard), exposed as POST/DELETE/releases/{id}/issues...gated on SETTINGS_MANAGE;release_issuetable (V15) and the auto-snapshot path remain intact. Acceptance met.