umputun / ralphex / 21842782071

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Add external git backend option (#79)

* feat(git): add external git backend with CLI support

extract backend interface from repo type and add externalBackend
that shells out to git CLI for all operations. configurable via
functional options on NewService with WithExternalGit().
addresses go-git behavioral differences (false dirty detection,
symlink handling, gitignore edge cases).

* feat(config): add git_backend config option

add git_backend field (internal|external) to config with INI parsing,
merge logic, and embedded defaults. wire up to NewService in main.go.
replace hand-rolled noopLogger with moq-generated mock.

* docs: update documentation for external git backend

update CLAUDE.md, README.md, llms.txt with git_backend config option
and external backend details. move plan to completed.

* fix(git): address copilot review feedback on external backend

add -- separator before paths in Add, MoveFile, IsIgnored to prevent
filenames starting with - from being interpreted as flags. improve
run() error to wrap underlying error when git output is empty.
use checkout -B in tests for idempotent branch creation.

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