feat(org-agenda): use project name as todo.org category

The %c column on agenda blocks rendered every project's todo.org as "todo:" -- org defaults the buffer category to the filename without extension, so every entry looked alike. An org-mode-hook now overrides org-category with the parent directory's basename (stripping a single leading dot, so ~/.emacs.d/todo.org reads as "emacs.d") whenever a todo.org file opens and its category is still the filename default. Explicit #+CATEGORY: keywords still win.

14 tests in test-org-agenda-config-category.el cover the helper's normal/boundary/error paths and the hook's override + explicit-category-preserved cases.

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