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.
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