Cookies set by browser extensions are not the website operator's
compliance responsibility. This adds stack-trace inspection to
filter out extension-originated document.cookie writes, and
annotates pre-existing cookies with a source field so operators
can triage them separately.
Introduces a CookieSource enum (SCRIPT / PRE_EXISTING) across
the full stack: PostgreSQL, coredata, service, HTTP handler, and
GraphQL schema. On conflict, source is upgraded from PRE_EXISTING
to SCRIPT when a page script is later observed setting the cookie.
Signed-off-by: Émile Ré <emile@getprobo.com>
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