Add nocopy.JSON

[kelindar]

Summary

Add nocopy.JSON, a raw JSON value that works in the same struct with both encoding/json and kelindar/binary.

• JSON unmarshal copies input using json.RawMessage semantics
• JSON marshal emits raw JSON rather than base64
• binary decode reuses the underlying input slice through the existing byteSliceCodec

Tests

Coverage verifies JSON input ownership, raw JSON output, binary aliasing, and the normal nocopy binary round trip.

Checks

• go test ./...
• go vet ./...
• git diff --check

[github-actions]

████████████████████ 100.0% on changed lines

9 lines changed   0 uncovered   1 file

 📂 1 file changed

	File	Coverage	Uncovered Lines
🟢	nocopy/types.go	100.0%	—

 📋 Full diff-cover report

Diff Coverage

Diff: origin/master...HEAD, staged and unstaged changes

• nocopy/types.go (100%)

Summary

• Total: 9 lines
• Missing: 0 lines
• Coverage: 100%

_{🛡️ diff-cover-action}

[coveralls]

Coverage Report for CI Build 30176981130

Coverage increased (+0.05%) to 90.315%

Details

• Coverage increased (+0.05%) from the base build.
• Patch coverage: 9 of 9 lines across 1 file are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	1776
Covered Lines:	1604
Line Coverage:	90.32%
Coverage Strength:	592.24 hits per line

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💛 - Coveralls