fix(insight): make remote exporters optional

[wangyb-A]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Issue Link, if available

Stacked on #661.

Addresses items 1–3 from #661 (comment). The ON_CHANGE design question remains outside this PR.

Description

Customers who use the default LambdaLogExporter should not package the S3 and CloudWatch Logs service clients. This PR marks those two Maven dependencies optional and documents the dependencies required by each remote exporter.

It also removes the internal AI review ledger from the public branch and updates the state-lifecycle documentation to match the implementation: invocation state is removed after every invocation end and recreated from stable hook data on resume.

Demo/Screenshots

Not applicable. This PR changes Maven metadata and documentation only.

Checklist

• I have filled out every section of the PR template
• I have thoroughly tested this change

Testing

• git diff --check
• mvn -B -q spotless:check --file pom.xml
• mvn -q -pl insight-plugin -am clean verify
• Installed the plugin locally and resolved it from an isolated consumer POM. The consumer dependency tree includes jackson-datatype-jsr310 but excludes software.amazon.awssdk:s3 and software.amazon.awssdk:cloudwatchlogs.
• mvn -q clean verify was attempted twice. Both runs reached the unchanged otel-plugin module and failed only at InvocationOtelPluginTest.invocationEnd_closesNestedSpansChildFirst; that test passes when rerun in isolation. This PR does not change OpenTelemetry code or dependencies.

Unit Tests

No new unit tests. The behavior change is Maven transitive-dependency metadata and was verified with an isolated consumer dependency tree.

Integration Tests

No new integration tests. Existing insight-plugin tests pass through the targeted reactor build.

Examples

No new example is needed for this metadata and documentation correction.

[wangyb-A]

Intent: Keep optional remote exporter clients out of default consumer packages and remove stale/internal documentation from the Workflow Insight change.
Not a goal: This PR does not redesign ON_CHANGE export scheduling or change runtime record behavior.