feat: initial release — env decoder extracted from ai-fabric

Public API: - Unmarshal(dst, opts...) - UnmarshalPrefix(dst, prefix, opts...) - AsMap() / AsMapPrefix(prefix) - Options: WithTrim, WithWeaklyTyped, WithTagName, WithDecodeHook Merges three divergent in-repo copies (ai-fabric/pkg/env, markets-platform/TP-general-code/pkg/system, and the var/agents/issue-* snapshots), adds error wrapping, prefix filter, and pluggable hooks. 15 pure-Go unit tests, no synthetic mocks, lint clean. Extracted per inventar/docs/asr/ASR-0008-ai-fabric-audit.md.
2026-04-24 13:41:13 +01:00
commit 288a5b600c
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