fix(introspection): preserve coordination ownership

[shreemaan-abhishek]

Summary

Uses a unique owner value for each introspection lock generation. A request releases only the lock it owns, and temporary non-cacheable results are scoped to the generation observed by waiting requests. Explicit cache bypass also skips coordination.

This is stacked on #6 and should be merged after it.

Checklist

• Tests pass with docker build -f tests/Dockerfile . -t lua-resty-openidc/test
• Tests pass with docker run -t --rm lua-resty-openidc/test:latest
• ChangeLog is updated for behavior changes, bug fixes, features, or user-visible documentation changes

Both complete CI runs pass.

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