consolidation-package test files exceed 300-line/40-line caps (pre-#237, untouched by #276's own cap sweep)

[cdeust]

Description

Three test files in the mcp_server/handlers/consolidation test family exceed
this repo's local 300-line/file, 40-line/method caps (CLAUDE.md § Code Style).
All three predate PR #277 (fix-consolidation-import-cycle-237) — confirmed by
diffing against origin/main before that PR's rebase — and PR #277's own
issue #276 cap-sweep only touched the four production consolidation files
(candidate_scan.py, drain_operations.py, cycle_orchestration.py,
headless_authoring.py), leaving these three sibling test files untouched:

$ git show origin/main:tests_py/handlers/test_headless_authoring_throttle.py | wc -l
786
$ git show origin/main:tests_py/handlers/test_ble001_sweep_handlers.py | wc -l
475
$ git show origin/main:tests_py/handlers/test_s110_sweep_handlers.py | wc -l
328

Measured against sizecheck.py (file/function line-count per coding-standards.md
§4, tightened to 300/40 by this repo's CLAUDE.md):

FILE OVER CAP: tests_py/handlers/test_ble001_sweep_handlers.py = 470
FILE OVER CAP: tests_py/handlers/test_headless_authoring_throttle.py = 788
FN OVER CAP: tests_py/handlers/test_headless_authoring_throttle.py::test_max_concurrent_pages_respects_cap = 45
FN OVER CAP: tests_py/handlers/test_headless_authoring_throttle.py::test_expired_deadline_skips_remaining = 57
FN OVER CAP: tests_py/handlers/test_headless_authoring_throttle.py::test_usd_cap_stops_further_calls = 44
FN OVER CAP: tests_py/handlers/test_headless_authoring_throttle.py::test_drain_missing_anchors_skips_ungroundable = 49
FN OVER CAP: tests_py/handlers/test_headless_authoring_throttle.py::test_cycle_never_invokes_ungroundable_scopes = 46
FILE OVER CAP: tests_py/handlers/test_s110_sweep_handlers.py = 326

(Line counts on PR #277's rebased head, bc1902c-derived tree — the 8-10 line
diffs PR #277 makes to these three files are mechanical monkeypatch-target
updates from its Move/Extract Function work, not new size growth; the file
totals above are within a couple of lines of the pre-PR origin/main baseline
quoted at the top.)

Why deferred rather than fixed in PR #277

PR #277 is scoped as a rebase-only change (see PR body / task note). Splitting
three files this large (one nearly 800 lines) the same way #276 split the
production siblings is a substantial Extract Function / Move Function exercise
in its own right, mixing an unrelated large refactor into a rebase PR
(coding-standards.md §15.1 — "never mix the enabling refactor and the feature
in one PR", read here as never mixing an unscoped refactor into a mechanical
rebase). Filed per §14.3 rather than silently deferred.

Acceptance criteria

• tests_py/handlers/test_headless_authoring_throttle.py ≤300 lines, every
  test method ≤40 lines (5 methods currently over: see measurements above).
• tests_py/handlers/test_ble001_sweep_handlers.py ≤300 lines.
• tests_py/handlers/test_s110_sweep_handlers.py ≤300 lines.
• Full existing suite passes unchanged (0 modified assertions) — pure
  Extract Function / Move Function / split-by-concern, same pattern as
  issue headless-authoring worker family: methods exceed 50-line cap (§4.2), CLAUDE.md size-limit text drifted from CONTRIBUTING.md #276's production-file split.
• ruff check / ruff format --check clean on the split files.

[cdeust]

Duplicate of #298, which already enumerates the full pre-existing size-cap backlog (229 file + 607 method breaches) of which these consolidation test files are a subset. Tracking one backlog, not slices of it.