feat(render): add the pure helpers for workspace-derived TODO keywords

Two pure functions behind the coming workspace-faithful #+TODO line. pearl--state-name-to-keyword slugifies a Linear state name to an Org keyword: upcased, non-alphanumeric runs collapsed to a single hyphen, edges trimmed, Unicode letters kept (so "Ångström" survives), and an all-symbol name falls back to TODO. pearl--derive-todo-line turns an ordered state list into the "ACTIVE... | DONE..." string: completed/canceled/duplicate types go after the bar, the rest before, order preserved within each side, de-duplicated by slug, with the hardcoded default returned for an empty list.

There's no caller yet -- the render integration and the gather pipeline land next. This is the derivation half of the keyword spec. The sync-back half it described is superseded by save-model-v2 (state reconciles at save) and the separate keyword-cycle task.

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