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-b0-bff-redis-deploy.md

@@ -105,7 +105,7 @@ Bad Gateway
 파드 안에서 직접 받아 해결했다. **alpine 기반 JRE 이미지에 `wget` 이 있다.**
 
 ```bash
-kubectl -n keycloak-lab exec <bff-pod> -- wget -qO- http://localhost:8083/actuator/beans
+kubectl -n keycloak-lab exec $(kubectl -n keycloak-lab get pod -l app=bff --field-selector=status.phase=Running -o jsonpath='{.items[0].metadata.name}') -- wget -qO- http://localhost:8083/actuator/beans
 ```
 
 ---
@@ -129,7 +129,7 @@ kubectl -n keycloak-lab exec <bff-pod> -- wget -qO- http://localhost:8083/actuat
 
 ```bash
 kubectl -n keycloak-lab exec keycloak-0 -- /opt/keycloak/bin/kcadm.sh config credentials \
-  --server http://localhost:8080 --realm master --user admin --password <pw>
+  --server http://localhost:8080 --realm master --user admin --password "$(kubectl -n keycloak-lab get secret keycloak-lab-secrets -o jsonpath='{.data.KC_BOOTSTRAP_ADMIN_PASSWORD}' | base64 -d)"
 
 kubectl -n keycloak-lab exec keycloak-0 -- /opt/keycloak/bin/kcadm.sh create realms \
   -s realm=keycloak-patterns -s enabled=true -s accessTokenLifespan=60
@@ -278,7 +278,7 @@ replica 를 늘리는 순간 로그인 자체가 실패한다.
 **무엇을 골랐는지는 실행 중인 인스턴스를 봐야 안다.**
 
 ```bash
-kubectl exec <pod> -- wget -qO- http://localhost:8083/actuator/beans
+kubectl -n keycloak-lab exec $(kubectl -n keycloak-lab get pod -l app=bff --field-selector=status.phase=Running -o jsonpath='{.items[0].metadata.name}') -- wget -qO- http://localhost:8083/actuator/beans
 ```
 
 ---
@@ -320,7 +320,7 @@ kubectl -n keycloak-lab exec keycloak-0 -- /opt/keycloak/bin/kcadm.sh create rea
 kubectl apply -f deploy/lab/k8s/bff-redis.yaml
 
 # 6. 자동구성 결과 — 파드 안에서 (프록시는 큰 응답에서 502)
-kubectl -n keycloak-lab exec <bff-pod> -- wget -qO- http://localhost:8083/actuator/beans > beans.json
+kubectl -n keycloak-lab exec $(kubectl -n keycloak-lab get pod -l app=bff --field-selector=status.phase=Running -o jsonpath='{.items[0].metadata.name}') -- wget -qO- http://localhost:8083/actuator/beans > beans.json
 python3 -c "import json;d=json.load(open('beans.json'));[print(n,'->',i['type']) for n,i in
   list(d['contexts'].values())[0]['beans'].items() if 'AuthorizedClient' in i['type']]"
 ```