test: add chime-deftest fixture macro and centralize test requiresHEADmain

Every test hand-wrote the same scaffolding: call a per-file setup, wrap the body in unwind-protect, call a per-file teardown. That's 419 unwind-protect blocks and 68 near-identical setup/teardown defuns, with no shared fixture because ERT has no native per-test setup.

I added a chime-deftest macro in test-bootstrap that creates the test base directory before the body and deletes it afterward, even on failure. I converted the 10 files whose fixture was exactly that base-dir create/delete and whose every test followed the standard shape, dropping their setup/teardown defuns. Files with custom fixtures (modeline state restore, validation reset) keep explicit setup/teardown, since the macro would silently drop their extra logic. I left the 4 tag-bearing integration files alone.

I also moved the near-universal testutil-general and testutil-time requires into test-bootstrap, so individual files no longer repeat them.

Behavior is unchanged: still 800 tests, full suite green. Converted bodies are copied verbatim, so the change only removes scaffolding, never an assertion.

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