Replace xerrors with fmt.Errorf

[keroxp]

Replace usages of golang.org/x/xerrors with the standard library fmt.Errorf across the project. Updated imports to add fmt where needed, adjusted tests to use fmt.Errorf, and removed the xerrors dependency from go.mod/go.sum. This simplifies error handling by relying on the standard library's %w error wrapping and removes an external dependency.

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.14%. Comparing base (c4378bf) to head (dbde825).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
env/env.go	66.66%	3 Missing ⚠️
up.go	25.00%	3 Missing ⚠️
cli/cage/upgrade/upgrade.go	66.66%	2 Missing ⚠️
cli/cage/prompt/prompt.go	50.00%	1 Missing ⚠️
run.go	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #107   +/-   ##
=======================================
  Coverage   90.14%   90.14%           
=======================================
  Files          38       38           
  Lines        1695     1695           
=======================================
  Hits         1528     1528           
  Misses        116      116           
  Partials       51       51           

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[Copilot]

Pull request overview

This pull request removes the external dependency on golang.org/x/xerrors and replaces it with the standard library's fmt.Errorf function, which has supported error wrapping with %w since Go 1.13. This simplifies the codebase by eliminating an external dependency while maintaining identical error handling semantics.

Changes:

• Replaced all xerrors.Errorf and xerrors.New calls with fmt.Errorf across 11 Go files
• Added fmt import to files where it was needed
• Removed golang.org/x/xerrors dependency from go.mod and go.sum

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
up.go	Replaced xerrors with fmt.Errorf for service creation and waiting errors
task_definition_test.go	Updated test mocks to use fmt.Errorf instead of xerrors.New
task/simple_task.go	Replaced xerrors error formatting for canary task failures
task/common.go	Replaced all xerrors calls with fmt.Errorf for task management errors
task/alb_task.go	Replaced xerrors with fmt.Errorf and refactored if-else to switch statement
run.go	Updated all error messages to use fmt.Errorf for task execution errors
rollout.go	Replaced xerrors with fmt.Errorf for rollout validation and execution errors
env/env.go	Updated environment validation and file loading errors to use fmt.Errorf
cli/cage/upgrade/upgrade.go	Replaced xerrors with fmt.Errorf for upgrade-related errors
cli/cage/prompt/prompt.go	Updated prompt confirmation errors to use fmt.Errorf
cli/cage/commands/command.go	Replaced xerrors with fmt.Errorf for argument validation
go.mod	Removed xerrors dependency
go.sum	Removed xerrors dependency checksums

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