Anchor scans to page 1; export stable prefixes

Anchor page-run selection to start at page 1 (select_continuous_run_from_page_1) instead of picking the longest run, so newest pages are preserved and the newest timestamp ordinal 0 is always captured. Change boundary logic to always assign stable UIDs and export the captured prefix of an oldest timestamp group even when it may be an unfinished 10-pull, emitting informational warnings (INCOMPLETE_TIMESTAMP_GROUP_EXPORTED / INCOMPLETE_ARC_10_PULL_EXPORTED) instead of dropping rows. Apply the same policy to Arc groups and update arc group annotation and warnings accordingly. Add a new console module for improved CLI output and update cli, live_capture, adapters, and session code to use the new run selection and console helpers. Update docs, mappings, and tests to reflect the new boundary/export behavior and messaging.

mappings/arc_miracle_box.json

@@ -27,6 +27,6 @@
   },
   "notes": [
     "Arc history is separate from Monopoly history.",
-    "Arc timestamp groups are expected to be complete 10-pull groups."
+    "Arc timestamp groups are 10-pull groups; an incomplete oldest group is still exported (stable prefix) with a warning."
   ]
 }