docs: replace prose placeholders in reproduction steps with executable commands

The audit found ~80 placeholders, and the damaging ones were where the
measuring apparatus itself was prose rather than a command:

  a6  "( curl ... ) & 를 20개 띄우고 wait"  — the 22.2s headline came from this
  a3  "<로그인 반복, sid 를 /tmp/sids 에>"  — the whole RPO measurement
  a3  "<sid 목록>"                          — the control it is compared against
  a5  "<수신 파드IP>"                       — the injection
  a8  writes /tmp/tok, reads /tmp/rt        — self-inconsistent, sent an empty token
  b3  $KC / $RT / $NEW never assigned
  c2  bare kcadm.sh with no kubectl exec
  a1  conntrack tuples written by hand, though the direction flips per restart

Each is now a shell-expandable form: pod IPs from jsonpath, the admin password
from the secret, ids from kcadm --format csv, conntrack tuples derived from
"conntrack -L" with awk rather than transcribed.

Then the rewritten commands were executed against the live cluster, and one
of them failed — the 20-way load generator, written as "kubectl run --rm -i",
lost its output stream twice in a row. That is a trap this series already hit
once, and the rewrite reintroduced it. A-6 now uses a resident probe pod that
collects into a file and is cat-ed once; verified 20/20 lines.

Evidence: docs/evidence/followup/05-command-reproducibility.txt

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

docs/experiment-00-session-replication.md

@@ -471,7 +471,7 @@ kubectl -n keycloak-lab exec keycloak-0 -- \
 ```sql
 select offline_flag, count(*) from offline_user_session group by offline_flag;
 select user_session_id, offline_flag, created_on, last_session_refresh
-  from offline_user_session where user_session_id = '<sid>';
+  from offline_user_session where user_session_id = '$SID';
 ```
 
 **이름이 내용을 배신하는 스키마다.** 운영에서 "온라인 세션이 DB 어디 있냐"를
@@ -648,6 +648,6 @@ kubectl -n keycloak-lab exec deploy/postgres -- psql -U keycloak -d keycloak \
   -c "select offline_flag, count(*) from offline_user_session group by offline_flag"
 
 # 노드별 캐시 엔트리 (파드 안에서)
-curl -s http://<pod-ip>:9000/metrics \
+curl -s http://$(kubectl -n keycloak-lab get pod keycloak-0 -o jsonpath='{.status.podIP}'):9000/metrics \
   | grep 'approximate_entries_unique{cache="sessions"'
 ```