Prevent circular load.properties

[SentryMan]

fixes #177

[agentgt]

I think a simple integer instead of a set of visited resources is safer solution that will not break backward compat.

[agentgt]

LGTM. I think we get this in before #176

[SentryMan]

@rbygrave please review when you get time

[Copilot]

Copilot reviewed 2 out of 7 changed files in this pull request and generated no comments.

Files not reviewed (5)

• avaje-config/src/test/resources/test-properties/chain/a.properties: Language not supported
• avaje-config/src/test/resources/test-properties/chain/b.properties: Language not supported
• avaje-config/src/test/resources/test-properties/chain/c.properties: Language not supported
• avaje-config/src/test/resources/test-properties/chain/d.properties: Language not supported
• avaje-config/src/test/resources/test-properties/chain/main.properties: Language not supported

Comments suppressed due to low confidence (1)

avaje-config/src/main/java/io/avaje/config/InitialLoader.java:212

• [nitpick] Consider replacing the hard-coded iteration limit '69' with a named constant (e.g., MAX_LOAD_ITERATIONS) to improve code clarity and maintainability.

if (sentinel == 69) {