feat(plugins): Phase 3 — ordering + cron liveness + reconciliation (T3.1–T3.6)

[lane711]

Summary

Phase 3 of the plugin framework overhaul — takes the system to production-ready by making dependency ordering, cron cold-start wiring, delivery reconciliation, and the Worker entry real.

Stacked on: #844 (lane711/plugin-system-define)

T3.1 — Dependency topo-sort + cycle detection

• plugins/topo-sort.ts: DFS topo-sort with visiting stack, throws PluginDependencyCycleError on cycles, warns/throws on missing dep IDs (strict/non-strict).
• MountablePlugin + WirablePlugin extended with id? + dependencies?.
• Both registerPluginRoutes and wireRegisteredPlugins now sort by dependencies before mounting/wiring. Old-style PluginBuilder plugins (no dependencies) keep their original order.

T3.2 — bootIsolate extraction

• HTTP middleware body factored into boot: BootIsolateFn — the same once-guarded initEmailService + wirePlugins call, now exposed on SonicJSApp.
• SonicJSApp.boot(env): callable from cron handlers, tests, or any non-HTTP context. Idempotent.

T3.3 — Wire scheduled() end-to-end

• createScheduledHandler gains optional boot? parameter: called before the first dispatch so cron-first cold isolates have a populated hook bus.
• my-sonicjs-app/src/index.ts restructured to export { fetch, scheduled } — a proper Worker object that wires plugins even when cron fires first.

T3.4 — wrangler.toml [triggers] codegen

• plugins/generate-triggers.ts: parseCronTriggers, updateWranglerTriggers, generateTriggersComment.
• my-sonicjs-app/scripts/generate-cron-triggers.ts: --check mode for CI sync guard.

T3.5 — Per-provider reconciliation + observability migration

• EmailProvider.reconcile?() optional method; EmailLogRow type.
• Migration 038: adds user_id, context_type, context_id, tenant_id, delivery_state, delivery_synced_at to email_log (all nullable, no defaults). Partial index for reconciliation; per-user history index.

T3.6 — CloudflareEmailProvider

• services/email/providers/cloudflare.ts: wraps the send_email Workers binding (MailChannels / CF Email Routing). Configurable defaultFrom.

Test plan

• npm test --workspace=@sonicjs-cms/core → 1647 passed, 0 failed
• tsc --noEmit → clean
• eslint src/ → 0 errors
• Topo-sort: 11 tests (ordering, cycle detection, strict/non-strict, id preference)
• boot-isolate: 8 tests (exposed, idempotent, shared once-guard, disableAll, cron handler)
• generate-triggers: 6 tests (parse, update, roundtrip)

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