test(e2e): parse a 98-page fixture once and clone it for every test

[Rl0007]

1. Every e2e run parsed the fixture several times (seed plus fresh imports in smoke, publish and tree), and the 6-page fixture was too small to show real-document problems.
2. The suite now parses a 98-page CC BY OpenStax chapter once per run and gives each test an API clone of it; tests read section titles from the seeded outline, and the tests for bugs fixed this week are normal tests again.
3. The CI worker now starts without CI: frappe runs every job in test mode when CI is set, which turned Local models off for parse, remediation and the assistant.

Verification

• Run 1 https://github.com/bwhtech/wikify/actions/runs/37520953899 (41 min): 23 passed, 16 failed, 1 flaky, 14 did not run. Jobs ran in test mode, so no AI step ran (seed "parsed" 98 pages in 42 s).
• Run 2 https://github.com/bwhtech/wikify/actions/runs/37527334564 (64 min, seed 25 min): 47 passed, 4 failed, 4 skipped, 6 did not run. Failures were suite assumptions about the larger fixture (group pages in the wiki, a section type name, figures below groups); fixed.
• Run 3 https://github.com/bwhtech/wikify/actions/runs/37535817271 (132 min, seed 60 min): 34 passed, 14 failed, 4 skipped, 9 did not run. 13 failures are AI calls failing in CI (assistant turns end in "error", ask returns HTTP 417 "the language model call failed"), being investigated separately; F-PUB-01 failed in the publish setup's figure pick, fixed after the run.
• Known open bugs stay expected failures at the failing assertion: Text of a parent section is missing from the published wiki #30, Remediate flagged resets every other page to its unremediated text #31, Asked to crop a figure, the assistant points to the wiki editor instead of the crop dialog #38.

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