docs: correct the places where documents contradicted their own evidence

An independent audit found ten documents printing values their evidence files do not contain. C-1 printed a session count of 0 where the evidence says 4, C-2 printed a success readback for a command that exited 1, and A-1 credited the conntrack flush with a split that the timestamps attribute to a pod restart four seconds earlier.

Also measured wal_writer_delay, which A-3 had asserted as matching without ever querying it, relabelled the A-6 control that moved 41 percent, noted A-8's nine-sample resolution, corrected D-1's RTO to the 41 seconds its own timeline shows, and added a correction banner to D-2. Every experiment document now links its evidence files with their real collection times, and the duplicate screenshots are documented as duplicates.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/evidence/a3-database-crash/08-wal-settings.txt

@@ -0,0 +1,9 @@
+=== A-3 이 가정만 하고 재지 않은 값 ===
+          name          | setting | unit | source  
+------------------------+---------+------+---------
+ commit_delay           | 0       |      | default
+ synchronous_commit     | on      |      | default
+ wal_writer_delay       | 200     | ms   | default
+ wal_writer_flush_after | 128     | 8kB  | default
+(4 rows)
+