feat(audit): full-history JSONL export in the actions menu

The menu so far only exported the current view (type + search
filter over the page 100-event window). A second action now fetches
the complete event history of the active project scope in one
EventLog call (the RPC has no cursor and no server-side cap) and
writes it as JSONL. Serialisation extracted to a top-level function
with unit tests; a stale comment advertising the never-shipped
"chain audit export" command now names "chain admin events --json".
Studio 0.73.0.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

CHANGELOG.md

@@ -6,6 +6,17 @@ lockstep.
 
 ## Unreleased
 
+### Added
+
+- **Full-history audit export.** The audit page's actions menu gains
+  "Export full log as JSONL" next to the current-view export: fetches
+  the complete event history of the active project scope (independent
+  of the type chip, the search field and the page's 100-event window)
+  and writes it as JSONL. The current-view export is unchanged; the
+  CLI `chain admin events --json` remains the canonical tool for
+  WORM-guaranteed exports (a stale code comment still advertised the
+  never-shipped `chain audit export` — fixed).
+
 ### Changed (usertest low-findings tail)
 
 - **Honest hero badge.** The store hero wears "TODAY"/"HEUTE" only