[loonghao]

Summary

Two related changes, both configuration and documentation only. No packaging
changes and no lockfile changes.

1. Docstring rules are now on, with the existing debt baselined. The deleted
   .flake8 configured flake8-docstrings (google convention), but the plugin
   was never installed in CI, so those rules never actually ran. Ruff's D rules
   are now enabled and every current finding is recorded as a per-directory
   baseline, so CI stays green on the current tree while any new docstring debt
   fails immediately.
2. llms.txt / llms-full.txt are now generated, not hand-written. A new
   script generates both, and a new CI job runs it ahead of release-please and
   opens a pull request whenever the output differs from what is committed.

Docstring baseline

There were 864 D findings when the rules were switched on. They are
recorded per directory tier in [tool.ruff.lint.per-file-ignores], each with its
finding count:

Directory	Findings
photoshop/api/enumerations.py	129
photoshop/api/save_options/**	112
photoshop/api/open_options/**	9
photoshop/api/colors/**	19
photoshop/api/** (the rest)	443
photoshop/** (package root)	8
test/manual_test/**	118
test/** (the rest)	45

The baseline is a ratchet, not a permanent exemption. Verified in both
directions:

• New debt fails. Adding an undocumented public function to
  photoshop/api/errors.py (a file whose D100/D101 are baselined) produces
  D103, which is not baselined for that tier, and ruff check fails.
• Fixing a tier shrinks it. Removing a rule from a tier's list makes that tier's
  remaining debt fail until it is fixed.

To clear a tier: fix the findings, delete the corresponding rule from that
tier's list. enumerations.py is the cheapest first target — all 129 are D101
on IntEnum constant tables where a per-class docstring is mostly noise.

llms.txt generation

• scripts/generate_llms.py writes llms.txt (a ~2.7 KB curated index) and
  llms-full.txt (~58 KB; README, examples, and a module index concatenated).
• Output is deterministic: newlines are written as LF explicitly, so a
  maintainer on Windows and CI on Linux produce identical bytes.
• --check exits non-zero when the committed files are stale. Run
  python scripts/generate_llms.py locally to regenerate.
• The llms-txt job sits in the Release workflow with needs: [preflight], and
  release-please now has needs: [preflight, llms-txt], so generation is
  ordered ahead of the release. release-please keeps if: always(), so a
  failure here reports red but does not block a release.
• The job opens or updates a pull request on docs/update-llms-txt rather than
  pushing to main, and is a no-op when nothing changed.

The llms.txt quickstart snippet is the example from the photoshop.Session
docstring, not a newly invented one.

Rules that could not be mapped 1:1 from .flake8

Flagged rather than silently dropped:

1. ignore = BLK100 — BLK100 comes from flake8-black, which is not in
   the dev dependencies and was never installed, so the ignore was inert. Dropped
   as dead configuration. Formatting is already enforced by ruff format in CI.
2. exclude included test, the ruff port does not. The test directory
   was excluded from flake8 but is linted under ruff. This widens coverage rather
   than narrowing it. Verified safe: E, W, F, Q, I and UP report zero
   findings on test/, so the widening introduces no new failures.
3. docstring-convention = google was inert for the reason above; it is now
   live as [tool.ruff.lint.pydocstyle] convention = "google" and is what
   produced the 864 baselined findings.
4. .pylintrc disabled C0103 (invalid-name) and R0903 (too-few-public-methods).
   These are pylint-only and have no ruff equivalent; pylint was never invoked by
   nox, pre-commit, or any workflow, so the file was dead configuration and was
   already deleted in an earlier PR. No ruff rules were added to replace them.

Validation

• ruff check photoshop (the CI lint command): passes.
• ruff check . (the full tree): passes.
• ruff format --check photoshop: 64 files already formatted.
• ruff check scripts/ and ruff format --check scripts/: clean.
• python scripts/generate_llms.py then --check: idempotent.
• pytest test/test_collections.py test/test_imports.py: 18 passed.
• pytest --collect-only: 169 tests collected.

The remaining tests under test/manual_test/ drive a real Photoshop COM
instance and cannot run in this environment; they were not executed here.