docs: epythet sweep (rendering repair, docstring coverage, README rewrite)

[thorwhalen]

Summary

WP6 epythet documentation sweep for this repository (one repo, one PR, per the sweep's own rules).

epythet validate (level 0/0.5/1, -i tests/ scrap/ examples/)

	error	warning	info	objects_undocumented	findings
before	6	126	72	50	204
after	0	26	48	0	74

All level-0.5 (parse) errors are fixed: unbalanced **/backtick markup, malformed :raises: field
lists, a doctest glued to prose, a bracket typo in a docstring, and a continuation line starting
with a :role: that broke docutils indentation parsing (mongodol/views.py). Sphinx build now
succeeds with only pre-existing, unrelated warnings (see "Declined" below).

Tests and doctests

	before	after
pytest -q	31 passed, 1 xfailed	31 passed, 1 xfailed (unchanged)
pytest --doctest-modules -q mongodol	44 passed, 1 xfailed	53 passed, 1 xfailed

No doctest needed skipping; none failed on master, and a local MongoDB was reachable, so every
new example was written against real, verified output (not mocked).

Coverage

Public surface: 108 objects checked. 50 undocumented before, 0 after. Every previously-undocumented
public class, method and function in mongodol/{base,stores,trans,util,add_ons,tracking_methods,tests/util}.py
now has at least a one-line, source-verified summary. All 14 of the package's __init__.py entry
points now have a docstring; the 6 that had none also gained a doctest, executed against a live
local MongoDB and pasted verbatim.

Correctness

• Fixed a stale/wrong docstring claim in get_mongo_collection_pymongo_obj: said the default
  connects to {DFLT_TEST_DB}/test; it actually connects to mongodol/mongodol_test.
• Removed a dead, unreachable second """docstring""" statement left inside add_clear_method
  (a leftover of an earlier edit — never rendered, just dead code).
• Fixed a bracket/backtick typo in disallow_sourced_interval_overlaps's :return: line.

Completeness (entry points)

MongoCollectionUniqueDocPersister, MongoCollectionFirstDocPersister, MongoCollectionMultipleDocsPersister,
MongoCollectionFirstDocReader, MongoCollectionMultipleDocsReader, get_mongo_collection_pymongo_obj,
mk_dflt_mgc, MongoClientReader, MongoDbReader: each gained an executed, verified doctest showing
its distinguishing behaviour (e.g. "first match wins, no uniqueness check" vs. "raises on ambiguous key").

README

Rewritten. The previous quick-start example imported py2store and a MongoCollectionReaderBase
class that no longer exist in this codebase — actively misleading for a human or an agent. Replaced
with a minimal example against the current API, executed and verified. Added the epythet-generated
"For AI agents" section (~/.config/epythet/config.toml: add, humour on, agents-first placement) —
this repo has no skills/subagents/instruction files, so the section documents only the published
llms.txt / mongodol.md / objects.inv.

Theme

Left theme = "auto" (no [tool.epythet] override) — nothing about this package (branding, ML/data
focus, notebook-heavy content, or a ≤5-page site) calls for a different theme per the decision procedure.

docsrc/

Was already removed from git history before this sweep (commit d60da1b); now also added to
.gitignore so a local epythet quickstart/make build doesn't show as untracked. CI already uses
the standard i2mint/epythet/actions/publish-github-pages job (.github/workflows/ci.yml), no legacy
epythet make . github step or tracked docs/ build output existed.

Declined (behaviour not changed without verification)

• mongodol/utils/werk_local.py:161 — LocalProxy.__init__'s type hint references a Local class
  that isn't defined anywhere in this vendored file, producing a sphinx_autodoc_typehints.forward_reference
  warning (3 occurrences, pre-existing). Left as is: this is a real code-level bug (a broken forward
  reference), not a docstring/rendering issue, and fixing it would mean either inventing a Local
  class or changing the annotation's meaning — out of scope for a docs-only sweep.
• Remaining epythet validate findings (level 0/1, all warning/info): D205/D415/D200 (blank-line
  and punctuation formatting on docstrings that already have a real summary — cosmetic, no meaning
  change), D105 (missing docstring on magic methods — explicitly lower priority than entry points
  per the sweep's rubric).

New artifact classes seen (proposed ledger rules)

None beyond what's already in the bundled ledger; every finding hit in this repo matched an existing rule.

Test plan

• pytest -q green (31 passed, 1 xfailed)
• pytest --doctest-modules -q mongodol green (53 passed, 1 xfailed), including every new/edited doctest run against a real local MongoDB
• epythet validate mongodol -i tests/ scrap/ examples/ --level 2: 0 errors (was 6, including 5 at level 0.5)
• epythet ai-readme-check .: ok
• Sphinx build (epythet make . html) succeeds

Claude-Session: https://claude.ai/code/session_01DRUfyM2tZNoZ9znKX5mmKY