Avoid noisy SSH signing failures during push

[pfleidi]

https://entire.io/gh/entireio/cli/trails/f00e8cc8686b

What

This PR narrows the object signer behavior to avoid noisy commit-signing failures during git push when Git is configured to use a custom SSH signing program that go-git cannot invoke.

How

• detect custom gpg.ssh.program values from system and global raw Git config before merge
• skip native SSH signing when that custom SSH signer is configured
• keep the change scoped to the existing system/global config behavior
• add focused tests for raw-config detection and scope precedence

Notes

This PR does not change repo-local signer configuration behavior.

[Copilot]

Pull request overview

Updates Entire CLI’s go-git object signer configuration resolution so checkpoint commit signing respects repo-local Git signing settings (notably gpg.ssh.program) while keeping signing best-effort when higher-scope config can’t be read.

Changes:

• Load and merge repo-local Git config alongside system/global scopes for signer setup.
• Detect custom SSH signing programs via scoped raw configs (pre-merge) and skip native SSH signing when appropriate.
• Expand unit tests around config precedence, raw-config merge behavior, and upper-scope load failure fallback.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
cmd/entire/cli/strategy/manual_commit_condensation.go	Removes an ireturn nolint on an interface-returning helper.
cmd/entire/cli/objectsigner.go	Adds repo-local config loading + effective gpg.ssh.program resolution to decide whether to use native SSH signing.
cmd/entire/cli/objectsigner_test.go	Adds regression coverage for precedence/merge behavior and local custom SSH signer handling.

[pfleidi]

Bugbot run

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

[cursor]

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