Anonymized projections of the corpus. Sender identities and
subject lines are replaced by stable hash keys; message content
is dropped. Suitable for sharing dataset views without exposing
real names or message text.

The salt is committed in source: anonymization here is about not
displaying real identities in published files, not about
preventing re-identification by anyone with access to the original
Zulip data.

Zulip REST client for the Clojurians instance, using HTTP basic
auth with an account email + API key. Credentials are read from
`ZULIP_EMAIL` / `ZULIP_API_KEY` env vars, or from `~/.zuliprc`.

Core namespace for zulipdata.

Graph-shaped views of the corpus, backed by JGraphT.

The two graphs we routinely care about:

- **channel co-membership** — undirected weighted; nodes are
  channel names, edges weighted by number of shared users.
- **user co-presence** — undirected weighted; nodes are
  anonymized user-keys, edges weighted by number of shared
  channels.

Plus utilities for community detection (Girvan-Newman, Label
Propagation), betweenness centrality, and conversion to
`kind/cytoscape` and `kind/graphviz` shapes.

Helpers for narrative-style analyses across the corpus: enriching
timelines with date columns, summarising channel lifecycles,
selecting channels by name or by shared user-base, and tracing
newcomers' prior channels.

Operates on the anonymized timeline returned by
`scicloj.zulipdata.anonymize/anonymized-timeline`.

Paginated, resumable pulls of Zulip channel history. Each forward
window is keyed on `(stream-name, anchor-id, batch-size)` and cached
on disk via pocket — so repeated runs and crash recovery are idempotent.

Cache directory: `ZULIP_CACHE_DIR` env var, or
`~/.cache/zulipdata-clojurians/` by default.

Projections of raw Zulip messages into purpose-built tablecloth datasets.
Raw messages are the source of truth; these views are built on demand.