refactor(workflows): split triage-intake into engine + source plugins

The triage-intake workflow had every source baked into one file, so adding or changing a source meant editing the workflow itself. I replaced it with a source-agnostic engine plus per-source plugins named triage-intake.<source>.org. The engine carries the anchor/sentinel logic, the four-bucket model, the Phase A-D orchestration, the todo.org persistence convention, and the exit criteria. Each source's scan, classify, render, and action knowledge moved into its own plugin.

Four general plugins ship in the template: personal-gmail, personal-calendar, cmail, and github-prs. Project-specific sources live in the project's .ai/project-workflows/ and are never synced. Phase 0 globs both directories so a project source can't silently drop out of the sweep.

I taught INDEX.org and the startup workflow-discovery drift check the namespace. A file matching <engine>.*.org is a plugin of that engine, not an orphan, and gets no trigger entry of its own. A "run the triage-intake workflow" request routes to the engine, never to a plugin.

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