feat: comp-3 decimal separator localization

[adrienaury]

No description provided.

[Copilot]

Pull Request Overview

This PR implements decimal separator localization for the COMP-3 codec, allowing users to use either dot (.) or comma (,) as decimal separators.

Key changes:

• Added configurable decimal separator parameter to COMP-3 codec
• Implemented dual input acceptance (both . and , separators) during encoding
• Added CLI flags to control output decimal separator format

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/posimap/core/codec/comp3.go	Added sep field to Comp3 struct and modified constructor to accept decimal separator parameter
pkg/posimap/core/codec/comp3_test.go	Updated test cases to include separator parameter and added test for different separator
internal/appli/config/model.go	Added Decimal field to Field struct and helper functions for dot/comma defaults
internal/appli/command/fold.go	Added usecomma CLI flag and integrated decimal separator configuration
internal/appli/command/unfold.go	Added usecomma CLI flag and integrated decimal separator configuration
internal/appli/command/testdata/fold/13-comp3.yaml	Updated test configuration to use comma separator flag
internal/appli/command/testdata/fold/13-comp3/stdout.jsonl	Updated expected output to use comma separators
internal/appli/command/testdata/unfold/13-comp3/stdin.jsonl	Updated test input to include comma separators
README.md	Updated documentation to describe decimal separator behavior
CHANGELOG.md	Added changelog entries for the new feature

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