v0.13.13

Changes since v0.13.10 (0.13.11 and 0.13.12 were develop-only
intermediate versions, rolled into this release).

Changed — librarian timeout durability (#337)

• A timeout-killed librarian run no longer strands its compile output.
  The nightly pre-dawn sweep bounds the librarian with a wall-clock
  timeout (SIGTERM, then KILL after a grace). Previously a timeout landing
  between the start-of-run pre-processing snapshot commit and the terminal
  librarian: processed N file(s) commit left every wiki page written so far
  uncommitted — silently absorbed by the next run's git add -A
  snapshot under a misleading message. athenaeum run now installs a
  SIGTERM/SIGINT handler for the writing phase that commits partial progress
  with a distinct, greppable message — librarian: partial run (interrupted after N file(s), …CUE F) — and exits 124 (matching coreutils timeout).
  Interrupt-commit contract: an interrupted run leaves the knowledge tree
  clean and attributes its work to a partial run commit, not the next run's
  snapshot. A normally-completing run is unchanged (still one processed N
  commit). The handler is opt-in (CLI-only) so in-process callers (the MCP
  server, tests) keep their own signal handling. Newly relevant under the
  claude-cli backend (v0.13.10), whose per-call subprocess latency makes
  timeouts more frequent.
• Hardening (post-review): the writing phase is wrapped in try/finally
  so the handlers are restored on every exit path — normal, interrupt, or an
  exception from rebuild_index / the terminal commit — and can never outlive
  the run for an in-process caller. Batch-mode interrupt accounting is
  documented as out of scope (a batch interrupt still commits written pages
  with a clean tree, but reports 0 file(s)). Test coverage over both
  SIGTERM (timeout) and SIGINT (Ctrl-C).

Documentation (#336)

• Surfaced the claude-cli subscription backend in the two top-level docs a
  reader scans first: the README env-var table now documents
  ATHENAEUM_LLM_PROVIDER (api | claude-cli, default api),
  ATHENAEUM_CLAUDE_CLI_BIN, and ATHENAEUM_CLAUDE_CLI_TIMEOUT; SECURITY.md's
  scope now names the claude-cli subprocess backend (argv-list construction,
  ambient Claude Code auth, neutral-cwd invocation). docs/configuration.md
  remains the source of truth.

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Full per-version detail in CHANGELOG.md (§ 0.13.11–0.13.13).