docs: install the [dev] extras, not a hand-written list

The documented setup was `pip install pytest pytest-asyncio aiosqlite`, three
lines under a rule saying not to install packages that are not declared in a
pyproject.toml. All three packages declare a `dev` extra, and the hand-written
list missed what was in it.

It cost three invisible things. Without `piexif`, `test_enrich_photo.py` fails
at import and the whole node suite stops at collection — not one test, the
run. Without `pytest-timeout`, `timeout = 60` in pyproject.toml is an unknown
config option, so the protection its own comment describes ("a hung test must
not wedge the run") was absent, announced only in a warning among the
deprecation notices. Without `ruff`, the project's linter is not installed.

`aiosqlite` never needed naming: it is a runtime dependency of the hub and the
node and arrives with the `-e` installs.

Verified with the corrected line: 2804 tests collected, 2800 passed, 4
skipped, and no unknown-option warning — nothing exceeds the timeout that is
now actually enforced.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UGY17EPph5LsLzePPXhUVc

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