fix(pull): match git no-upstream advice

[genedna]

No description provided.

[Copilot]

Pull request overview

This PR updates libra pull’s “no upstream / no tracking” failure path to match Git’s unprefixed advisory block (rather than an error: line), while preserving the existing stable error code (LBR-REPO-003) and exit code (128). It introduces a dedicated CliErrorKind variant to support Git-style unprefixed runtime failures and updates tests/docs/compat notes accordingly.

Changes:

• Add CliErrorKind::UnprefixedFailure + CliError::unprefixed_failure(...) to render runtime advisory blocks without error: / fatal: prefixes.
• Update pull’s missing-tracking handling to emit Git-style advice, and to include the single configured remote name in --set-upstream-to=... when exactly one remote exists.
• Update integration tests and documentation to reflect the new advisory output and compatibility behavior.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/command/pull_test.rs	Tightens assertions for Git-style “no tracking” stderr and adds coverage for single-remote upstream advice.
src/utils/error.rs	Introduces UnprefixedFailure to support unprefixed Git-style runtime advisory rendering (plus unit test).
src/command/pull.rs	Emits Git-style no-tracking advice (merge vs rebase wording; single-remote hinting) instead of prefixed error + hints.
docs/development/commands/pull.md	Documents the Git-style advisory behavior and the single-remote substitution rule.
docs/commands/zh-CN/pull.md	Adds user-facing example + updates scenario table to describe advisory-block output.
docs/commands/pull.md	Adds user-facing example + updates scenario table to describe advisory-block output.
COMPATIBILITY.md	Notes the new Git-style no-upstream tracking advice behavior under pull.