Chat/AI runtime: Keychain key in argv + SDK pool ref-count race, plus chat/AI/ade-action god-file & typed-dispatch decomposition #461

Summary: Two chat/AI-runtime defects (Keychain secret in argv; Droid/Cursor pool ref-count race) plus the large chat/AI/ade-action maintainability + type-safety surface centered on a 25k-line god-file and an untyped action registry.

Runtime defects:

• macOS Keychain API keys written via argv, exposing provider secrets in the process table (low). writeMacosKeychainSecret() calls runSecurity(['add-generic-password',…,'-w',value]) via spawnSync — the raw key is world-readable via ps for the spawn lifetime (the read path uses stdin). apiKeyStore.ts:195,:202. Fix: feed the secret via stdin / prefer safeStorage-encrypted credentialStore.
• Concurrent acquire of Droid/Cursor SDK pool can hand a connection to a non-owner without incrementing its ref (leak or premature dispose) (low). Non-owner bumps ref only if (live?.pooled===pooled) but always returns pooled; release later decrements a stale generation. droidSdkPool.ts:90,:95; cursorSdkPool.ts:227,:234. Fix: make the ref handoff atomic with entry lifetime.

Decompose chat/AI/ade-actions structure & typing (related ADE-61):

• agentChatService.ts is a 25,342-line god-file (~20,400-line factory). :4957,:14438,:13924,:15134,:5506 — extract per-provider runtime handlers.
• Provider routing is a duplicated if (provider===…) ladder repeated ~280 times (a missed arm falls to default). :3287,:4060,:4116,:4178,:2548 — one ProviderAdapter record with compiler exhaustiveness.
• ADE action domain services typed as Record<string,unknown> (OpaqueService), erasing the contract (~77 casts; dispatch service[action]). registry.ts:822,:824,:1370; automationService.ts:1647; adeRpcServer.ts:3601 — real interfaces + typed registry map.
• Every run_ade_action eagerly rebuilds the entire ~46-service domain map to return one service (ADE-61 only partially fixed). registry.ts:2795,:837; automationService.ts:1643; adeRpcServer.ts:3596; main.ts:4016 — make the map lazy; memoize buildAdeActionRuntimeForAutomations().
• ctoOperatorTools.createCtoOperatorTools is one ~2,500-line factory registering ~103 tools inline. ctoOperatorTools.ts:528 — group tools by concern.
• registry.ts mixes allowlist + 19 domain-service builders + arg-normalization in one 2,864-line module. :1369,:2471,:2795 — move builders into domains/<name>DomainService.ts.

Verification confidence: High for the Keychain leak and all line/grep counts; medium for the pool race (narrow window). ADE-61's apns-only fix confirmed as the partial fix.