Release 0.2.0

[jehrr]

Version bump and the CHANGELOG section for the audit work, in their own commit so the tag has something to point at.

Everything under [Unreleased] moves into a dated [0.2.0]. The released [0.1.1] and [0.1.0] bodies are byte-identical to what git show v0.1.1:CHANGELOG.md returns — only the link reference list grew.

It leads with a blockquote, because the behaviour change is exactly the kind an existing user would otherwise discover from a row count:

A --mode events walk used to stop at the first event page that produced no markets and still report status: complete with exit 0 — and a separate defect was making healthy event pages produce no rows, so that was a common case rather than an edge one. A walk that previously returned a few pages' worth of markets under a green status now returns the whole listing's.

What landed in this release:

#15	the --mode events walk ending early under a green status, and the classifier reading every served page as its own 404
#16	atomic JSON, CSV and sidecar writes
#17	a live cross-engine canary, and the Docker base pinned by digest
#18	a regression in #17, found by running the README in a fresh clone
#19	events_on_page_1 counting the wrong thing after a merge

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