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Add library-management module: console app evolved into a Spring Boot 4 REST API

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Stage 2 console classes and the shared LoanPolicy, then a Spring Boot 4.1.2 + JPA API
(H2, @Version optimistic locking, problem+json errors). Tests write output/ transcripts
while asserting the same numbers; scripts regenerate everything.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b4DPL6dtpFg4U4LHc2
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Claude
2026-11-14 21:21:16 +05:30
parent b9aeb78b24
commit 26ece9cc9b
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library-management/output/05-race-with-version.txt
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8 threads borrow the last copy at once (Book has @Version)
successful borrows : 1
refused by optimistic-lock failure : 6
refused for any other reason : 1
loan rows in DB : 1
availableCopies : 0