refactor(appkit): introduce CoreServiceRegistry and ServiceLocator

[ditadi]

Stack

• (this PR) — CoreServiceRegistry + ServiceLocator (layer 1, base: main)
• refactor(appkit): split SQLWarehouseConnector into submit/get/poll/transform #372 — split SQLWarehouseConnector into submit/get/poll/transform (layer 2, base: this PR)

Review independently — this PR is groundwork, no behaviour change.

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AppKit's core previously ran a hardcoded boot sequence for cache +
telemetry. This refactor introduces a generic registry so the core no
longer names concrete services:

• CoreServiceFactory<T> — interface every core service implements,
  returning { instance, shutdown } (or null for intentional opt-outs).
• CoreServiceRegistry — boots a list of factories in declared order,
  shuts down in reverse, doubles as a typed locator via get<T>(name).
• bootstrap-factories.ts — composes the list _createApp boots,
  living next to the concrete service modules so core/appkit.ts stays
  free of concrete-class imports.

Cache and Telemetry are migrated to expose .factory() static methods
and flow through the registry. Behaviour is identical: same boot order,
same shutdown order, same opt-out semantics.

Plugins now receive a typed services: ServiceLocator through
attachContext, in addition to the existing per-service fields kept
for backwards compatibility (cache, telemetry, plus a taskflow
placeholder typed as unknown for forward compat). New plugins should
consume services.get<T>(name); the named legacy fields are marked
@deprecated.

This PR is groundwork — no behaviour change, no public-API removal.
The purpose is to make room for a third core service (TaskFlow) without
re-threading the cross-package attachContext contract: adding a new
service now only touches the service module and bootstrap-factories.ts.
TaskFlow itself is intentionally NOT in this PR; it lands in a follow-up.

Verified: pnpm -r typecheck, pnpm build, full pnpm test
(122 files, 2255 tests) all green.

Signed-off-by: ditadi victordperd@gmail.com

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[ditadi]

Superseded by #374 — replatformed onto git stack with branch name stack/taskflow/service-registry.