test: wire leaky.eml into the anti-leak suite (red, defect 2)

test_no_ioc_holds_a_recipient_address grepped for the literal
"example.org", and every existing fixture hides the recipient address
as base64, so URL redaction could be disabled entirely and both this
test and test_cli's counterpart stayed green.

leaky.eml carries you@example.org in five URL shapes plus a From
display-name trap. Adding it to the fixture list, plus a new test
asserting on the raw address and its percent-encoded form, turns the
suite red: the valueless-query-parameter defect (redact.py) currently
lets ?victim@example.org through as a kept parameter NAME. Left
failing on purpose; the next commit fixes redact.py and turns it
green.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KphFXTc2QajxXsHWyvGJ4R

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