[JackieTien97]

Description

SessionSeedNodeFallbackIT constructs its discovery suppliers with hardcoded root/root credentials, while its business session uses the client defaults. In downstream editions with a different default password, discovery can fail authentication and retain the initial seed snapshot until the endpoint assertion times out.

Use SessionConfig.DEFAULT_USER and SessionConfig.DEFAULT_PASSWORD for both suppliers. Centralize IT authoring and verification guidance in integration-test/AGENTS.md, covering portable credentials, asynchronous waits, recovery, cleanup, test profiles, and Edge/IDE workflows. Replace duplicated IT instructions in the root CLAUDE.md with an explicit instruction to read the module guidance.

Validation

• mvn spotless:apply -pl integration-test -P with-integration-tests passed.
• Documentation links and Maven profile names checked; the Java test is unchanged by the documentation edits.
• Clean reactor verification passed for the Java change (2fd1c25b05):

mvn clean verify -DskipUTs \
  '-Dit.test=SessionSeedNodeFallbackIT#testBusinessAndBackgroundRecoveryThroughOmittedSeed' \
  -DfailIfNoTests=false -Dfailsafe.failIfNoSpecifiedTests=false \
  -pl integration-test -am -PClusterIT -P with-integration-tests

The selected IT method ran against an Apache IoTDB 1C3D cluster: 1 test, 0 failures, 0 errors, 0 skipped. Downstream editions were not executed.

This PR has:

• been self-reviewed.
• added integration-test authoring guidelines.
• been tested in an IoTDB test cluster.

Key changed/added classes

• SessionSeedNodeFallbackIT