fix(org-agenda): filter missing base files; drop the roam-source doc claim

cj/--org-agenda-base-files now drops files that do not exist (a fresh machine may lack the synced calendars or the inbox), and org-agenda-skip-unavailable-files is set as a backstop, so org-agenda never prompts to create a missing path — the interactive-prompt class that once hung the chime daemon. The filter lives in the one shared helper, so the agenda builders, single-project view, and the chime initializer all get the existence check. Also correct the docs: the commentary and docstrings claimed org-roam nodes tagged "Project" are agenda sources, but they were never scanned; roam Project/Topic notes are refile targets (org-refile-config.el), not agenda sources.

Claude-Session: https://claude.ai/code/session_01BqrdWUo9GcznYX2pZr76gZ

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