v2.10.0

v2.10.0 — 2026-06-07

Added — code_graph docstring-presence signal (memex#34)

memex stays EXTRACTOR-EXTERNAL — it does NO source/AST parsing to derive
docstrings. This release adds forward-compatible storage + documents the
limitation; it does not (and must not) compute docstring presence itself.

• Schema (db/code_graph.sql). Added a NULLABLE has_docstring INTEGER
  column to the nodes table (values 1 / 0 / NULL). Fresh installs get it
  via the CREATE.
• Additive migration (scripts/install.py). CREATE TABLE IF NOT EXISTS
  cannot add a column to an existing nodes table, so the code_graph
  additive-reapply path now runs a GUARDED ALTER TABLE nodes ADD COLUMN has_docstring INTEGER — it reads PRAGMA table_info(nodes) and only adds the
  column when absent, re-checking on every call (idempotent, no data loss on
  re-run). Pre-2.10 stores (the real one already holds atelier+kaizen+memex
  rows) migrate in place; existing rows read NULL.
• Ingest passthrough (scripts/code_graph.py). ingest_graph /
  ingest_fragment now pass through each graphify node's optional
  has_docstring: missing / None → NULL, explicit 0 / False → 0, any
  other truthy → 1. graphify does NOT emit it today, so re-ingesting current
  graphs stores NULL everywhere and preserves EXACT prior behavior (counts +
  the run-66 idempotency guarantee unchanged; the upsert updates has_docstring
  on conflict so values stay stable across re-ingest).
• Query inclusion. where_is, module_map, neighbors, and the node-row
  results of callers / dependencies now surface has_docstring on returned
  rows. Convention: the key is ALWAYS present; its value is None when NULL.
• Documented limitation. NULL means "extractor did not report" (UNKNOWN),
  NOT "no docstring" — so there is deliberately NO "find undocumented" query.
  The rationale_for edge relation is NOT a docstring proxy (it is
  comment-derived # NOTE / # WHY, body-line-keyed, not the def line — using
  it as one caused false positives in a real run). Caveats added to
  internal/codegraph/query/SKILL.md, internal/codegraph/ingest/SKILL.md,
  db/code_graph.sql, and the scripts/code_graph.py module docstring.