Add self update alias

[kindermax]

Summary

• add update as an alias for lets self upgrade
• verify both command names invoke the same upgrader path
• document the new alias in the changelog

Why

lets self update is a familiar spelling for updating a CLI. Making it a native alias preserves the existing upgrade implementation, flags, and error behavior without duplicating command logic.

User impact

Users can now run either lets self upgrade or lets self update. The --pre flag remains available through the alias.

Validation

• lets test — 307 Go tests, 150 Bats tests, and 4 completion tests passed
• lets lint — 0 issues
• go run ./cmd/lets self update --help — alias resolves to the upgrade command and exposes --pre

Summary by Sourcery

Add a new update alias for the lets self upgrade command and ensure both names share the same upgrade behavior.

New Features:

• Introduce update as an alias for the self upgrade CLI subcommand.

Documentation:

• Document the new update alias for lets self upgrade in the changelog.

Tests:

• Extend self command tests to verify both upgrade and update subcommands invoke the same upgrader path.

[sourcery-ai]

Reviewer's Guide

Adds an update alias for the lets self upgrade CLI subcommand, wires it through the existing upgrade command implementation, and extends tests and documentation to cover the alias.

Sequence diagram for self upgrade/update alias behavior

sequenceDiagram
    actor User
    participant CLI as lets
    participant UpgradeCommand
    participant Upgrader

    alt upgrade_or_update
        User ->> CLI: lets self upgrade
        CLI ->> UpgradeCommand: RunE
    else upgrade_or_update
        User ->> CLI: lets self update
        CLI ->> UpgradeCommand: RunE
    end

    UpgradeCommand ->> UpgradeCommand: initUpgradeCommandWith
    UpgradeCommand ->> Upgrader: createUpgrader
    Upgrader -->> UpgradeCommand: [upgrader ready]
    UpgradeCommand -->> User: [upgrade completes]

Loading

File-Level Changes

Change	Details	Files
Share the same upgrade implementation between self upgrade and the new self update alias.	Extend the upgrade command definition to declare update as an alias of upgrade. Keep argument validation and execution logic unchanged so both names follow the same path and behavior.	internal/cmd/upgrade.go
Verify both self upgrade and self update invoke the upgrader through the same command path.	Refactor the self upgrade test to run as a table-style loop over both upgrade and update. Ensure the mock upgrader is invoked regardless of which alias is used. Maintain existing test setup for root and self commands while reusing it across both cases.	internal/cmd/root_test.go
Document the new update alias in the changelog.	Add an Unreleased changelog entry noting update as an alias for lets self upgrade. Keep existing changelog entries and ordering intact.	docs/docs/changelog.md

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[sourcery-ai]

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