v0.9.4

Added

• Scope API (logtide_sdk.scope, exported from the package root): per-request/per-task context built on contextvars — push_scope(), get_current_scope(), set_tag, set_extra, set_user, set_session_id, add_breadcrumb. Scope state (tags, user, breadcrumbs, session, trace context) is merged into every captured entry; entry-level values win.
• Breadcrumbs: ring buffer (default 100, oldest evicted), attached as metadata.breadcrumbs.
• User context (User) attached as metadata.user; session_id sent as a top-level field.
• Per-request scope isolation in all middleware (Flask, Django, Starlette/FastAPI): breadcrumbs/user/tags set inside a handler stay local to that request, and handler logs inherit the request's trace context.

Changed

• Trace-id resolution order in log() now follows the spec: explicit value → scope trace context → client context/auto-generation.