test(config): bind bootstrap API and public documentation

[seonghobae]

Purpose

Close a path-disjoint quality/documentation gap on protected develop@622e5e6c3d534f230c390f10e3832efadfc01825: Config Server is an independently runnable production module, but its public ConfigServerApplication bootstrap class/method historically had no beginner-readable Javadoc and protected source had no application-bootstrap test.

This Draft is deliberately narrower than active #189. #189 owns Config Server Git repository authority; #193 owns inbound Config Server client identity. This PR changes only the bootstrap application class/test. It does not change CONFIG_REPO_URI, promote Config Server to the default supported topology, add credentials, change dependencies, or claim repository-wide coverage (#205).

Exact current identity

• protected/live base: develop@622e5e6c3d534f230c390f10e3832efadfc01825;
• branch: quality/config-bootstrap-docs-tests-622e5e6;
• fail-first source head: 6c99beb84cdd91865e0a4102618ad0a49c2ddc32;
• exact current GREEN source head: 0f4a836f012a6c695ead9e9d45911ff004edd918;
• current synthetic merge preview: 1c707d679c4562adea2133cd46f913cddfdc34c1;
• Draft / mergeable: true / true;
• changed paths: exactly ConfigServerApplication.java and ConfigServerApplicationContractTest.java;
• formal reviews: none;
• unresolved review threads: zero.

Every check/review from the RED head, predecessor source, or another base is historical and does not transfer.

RED → GREEN

The fail-first commit added ConfigServerApplicationContractTest before production documentation changed. It preserves the real @SpringBootApplication / @EnableConfigServer bootstrap and public-static main(String[]) entry point while requiring beginner-readable class/method Javadoc.

Exact current source 0f4a836f012a6c695ead9e9d45911ff004edd918 applies the smallest correction: ConfigServerApplication.java now explains that it starts the standalone mightyETL Config Server, that repository selection remains #179/#189's deployment authority, inbound client authentication remains #193's separate security authority, and module existence does not make Config Server a required/default deployment service. main(String[]) documents the Spring Boot argument contract. Annotations and SpringApplication.run(...) behavior are unchanged.

Current hosted evidence

All exposed workflow aggregates associated with exact current source head are terminal-success:

• CI 31352330727;
• Dependency Review 31352330693;
• CycloneDX SBOM 31352330697;
• SAST Semgrep 31352330707;
• Security Scan 31352330686.

These green aggregates are compatibility/development evidence, not merge authorization. Current direct-develop pull-request workflows generally execute GitHub synthetic merge previews rather than accepted literal source; protected ETL JaCoCo can still analyze zero classes (#162/#164), repository-wide coverage scope is incomplete (#205), Maven vulnerability evidence can be incomplete despite a green aggregate (#196), and qualifying independent review is absent.

Merge boundary

Keep Draft. Merge only when the unchanged exact source head has accepted literal-source deterministic/security evidence, complete same-revision dependency/vulnerability evidence, non-vacuous applicable owned-production coverage, every required repository/security gate, zero valid unresolved findings, and qualifying independent non-author formal approval where governance requires it. No predecessor-head, other-PR, incomplete-scanner, status-only, skipped-required, or synthetic-merge-only evidence transfers.

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