docs(keycloak-session-store): import the session-storage lab as a new project

The keycloak project ended with four open questions that design could not
settle. A two-VM lab was built to answer them by measurement, and this is
that material: 26 experiments, 125 raw command outputs, 22 browser captures.

Follows the import procedure in README.md.

  source/     the originating repository verbatim — 78 documents, 28 SVGs,
              8 manifests, plus .source-revision recording the commit
  final/      the SSOT
    document.md   729 lines written from the 29 experiment documents, not
                  concatenated: what was predicted, what was measured, and
                  where the measurement itself was wrong
    evidence/raw    125 outputs, flattened to <experiment>__<file> because
                    the originals collided (01-baseline.txt appeared three
                    times) and the audit only globs the top level
    evidence/meta   one per raw file; command and exitCode are null and the
                    README says why rather than inventing them
    evidence/browser  22 captures
    assets/       three diagrams through techviz
    .techviz/     their VizSpecs

A separate project rather than an addition to keycloak: the B-layer answers
that project's four questions, but the A, C and D layers are about cluster
failure, SSO and operations, and one document.md should hold one subject.
The four question records there can point here through 관계.

Recorded rather than papered over: only three of the 28 diagrams were
remade. The repository forbids hand-drawn SVG and forbids titles inside the
canvas; all 28 originals carry both, so converting them is redrawing, not
reformatting. They stay in source/ and the gap is written into the document.

verify-pipeline.py passes. audit-records.py reports no issues.

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

docs/clean-architecture-backend-template/final/evidence/raw/tl-outbox-unsatisfiable-condition.txt

@@ -0,0 +1,26 @@
+--- the condition chain
+18:import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+50:  public OutboxProperties outboxProperties() {
+62:  public OutboxRetryScheduler outboxRetryScheduler(OutboxProperties properties) {
+81:  @ConditionalOnBean({OutboxRepository.class, OutboxEnvelopeFactory.class})
+83:  public OutboxRelay outboxRelay(
+106:  @ConditionalOnBean(OutboxRelay.class)
+108:  public OutboxRelayWorker outboxRelayWorker(OutboxRelay relay, OutboxRetryScheduler scheduler) {
+123:  @ConditionalOnBean(OutboxRelayWorker.class)
+125:  public MessagingOutboxRelayLifecycle outboxRelayLifecycle(
+138:  @ConditionalOnBean(OutboxRepository.class)
+140:  public OutboxCleanupJob outboxCleanupJob(OutboxRepository outbox, OutboxProperties properties) {
+155:  public InboxRetentionPolicy inboxRetentionPolicy() {
+167:  @ConditionalOnBean(InboxRepository.class)
+169:  public InboxCleanupJob inboxCleanupJob(InboxRepository inbox, InboxRetentionPolicy policy) {
+
+--- main references to the only implementations of the two root ports
+$n                       mainRefs=$(grep -rlw $n --include=*.java src/*/src/main src/*/*/src/main src/messaging/*/src/main 2>/dev/null | grep -v /$n[.]java$ | wc -l)
+$n                       mainRefs=$(grep -rlw $n --include=*.java src/*/src/main src/*/*/src/main src/messaging/*/src/main 2>/dev/null | grep -v /$n[.]java$ | wc -l)
+
+--- the same starter DOES provide a default for another port
+360:  @ConditionalOnMissingBean(dev.caskeleton.messaging.schema.MessageCodecRegistry.class)
+361-  public dev.caskeleton.messaging.runtime.RegisteredMessageCodecs messagingCodecs(
+362-      ObjectProvider<MessageContracts> contracts) {
+363-    return dev.caskeleton.messaging.runtime.RegisteredMessageCodecs.of(
+364-        dev.caskeleton.messaging.schema.json.JacksonMessageCodec.of(