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ItemIsASum and Quantities are exporter columns that were missing from
MAIN_CSV_HEADER_COLUMNS, causing them to be misidentified as numeric cost
value categories on re-import. Also initialise rate_cost_schedule to None
before the search loop to avoid UnboundLocalError when no match is found.

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bd57cc8 shifted the directrix curve by -mean before sweeping, then
translated the result by -mean again instead of +mean, placing the
geometry at original - 2*mean. Negating the restore translation fixes
the position; shape size was unaffected.

cc @aothms

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Cache all API responses at module level with sleeps between calls to
avoid hitting the bSDD rate limit. Fix test_get_class_relations to
call get_class_relations() instead of get_class_properties(uri, True).
Fix "X" and "Y" in [...] assertions which only checked "Y".

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The bSDD API rate-limits aggressively; without retry logic the client
silently returns the 429 JSON dict, causing KeyError when callers
access expected response keys. Client.get() now retries up to 5 times,
sleeping for the Retry-After header value (defaulting to 5s).

Remove the manual time.sleep() calls from the test module now that the
client handles rate limiting automatically.

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Move has_material_styles into the Root tool so it can be mocked in core
unit tests; the private function was calling ifcopenshell.util.element
directly, bypassing the tool layer and crashing the test.

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Run the RSS measurement in a subprocess so the fixture file is not
already in the page cache from earlier tests (which made both deltas
read as zero). Add psutil to the CI pip install so this test is not
skipped there.

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The retry logic alone is not sufficient: back-to-back calls can exhaust
the retry budget before the rate limit window resets. Sleep 3s between
each module-level prefetch call (the API limit is ~1 req/2s).

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