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F1 CRITICAL: Remove all eager old-generation deletion from secret_seam.rs and global_config/mod.rs. Old-gen retirement moves entirely to two-cycle GC. Add 5 deterministic JSON-write-failure tests proving old generation still hydrates after a failed atomic write (instance env/auth/provider, definition env, global env). F5b (collect_live_refs validates): Reject malformed/duplicate coordinates and inline+ref conflicts — any such condition makes the sweep a no-op. Add 12 validation tests. F5a (GC exclusion, not just time): Wrap extraction + global save + GC under managed_agents_store_lock so final JSON read and remove_batch are indivisible against a concurrent save. Add 3 synchronized interleaving tests. F3 (fail-closed global + definition tiers): - Global: load_global_agent_config() returns Err on missing/corrupt ref; callers in runtime.rs/runtime_commands.rs now surface global_unavailable flag instead of unwrap_or_default(); spawn_agent_child uses ? to abort. - Definition: AgentDefinition gains secrets_unavailable field (#[serde(skip)]); hydrate_all_secrets_for_records sets it on definition records; spawn gate in runtime.rs refuses linked instances when definition is unavailable; status_for_with checks definition_unavailable tier; agents_deploy.rs checks it too. Add definition_tier_tests.rs with 3 tests. F4 (dev migration marker only on clean completion): Extract pure decision core plan_dev_secrets_migration(); marker withheld when conflict_count > 0; partial progress (non-conflicting keys) still written for next boot; log emitted. F2 (cleanup authorization + legacy live file): Replace bare agent_secret_store_pub().is_some() gate with extraction_verified() that reloads both stores and checks no secrets_unavailable flags set after hydration. Add scrub_legacy_live_file() to explicitly scrub/delete legacy managed-agents.json after verified extraction. Add 4 tests. AgentDefinition derives Default to support test helper construction. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>