docs: architecture.md test count is stale (says 25, suite has 44)

[himanshu231204]

Summary

docs/reference/architecture.md claims the test suite has 25 tests, but the suite now has 44 tests (43 passed + 1 skipped). The count is stale.

Where

docs/reference/architecture.md line 177:

25 tests, about 1.5 seconds, offline by default.

Verification

python -m pytest --collect-only -q
# 44 tests collected
python -m pytest -q
# 43 passed, 1 skipped

Breakdown: tests/test_store.py (19, incl. 3 parametrized cases + 1 skipped fastembed test), tests/test_server.py (6), tests/test_cli.py (19, incl. 12 parametrized cases).

Suggested fix

Update the count to 44 (or drop the specific number and say "the suite runs offline in about a second"). The "about 1.5 seconds" figure is also machine-dependent — consider softening it.