Refresh zsh completion cache after lets updates

[kindermax]

Summary by Sourcery

Refresh and cache the zsh completion script for the lets CLI based on changes to the lets executable and its version metadata.

Enhancements:

• Track a signature of the resolved lets executable, its metadata, and version output to decide when to regenerate the zsh completion file, avoiding unnecessary refreshes.
• Improve plugin initialization to use the absolute plugin directory path consistently and clean up the temporary refresh helper function after use.

Documentation:

• Document that plugin-managed zsh completions are refreshed automatically when lets changes and instruct users to reload their shell after updating the lets binary.

Tests:

• Add a zsh test script that verifies completions are regenerated only when the lets binary, its version, or file characteristics change, and not on every plugin load.

[sourcery-ai]

Reviewer's Guide

Adds a robust cache-refresh mechanism for the zsh completion script so it is regenerated when the underlying lets executable or its version/metadata changes, documents the behavior, and introduces a regression test to verify the refresh logic.

File-Level Changes

Change	Details	Files
Replace one-time completion generation with a signature-based refresh function that re-runs lets completion when the resolved lets binary, its metadata, or reported version changes.	Ensure PLUGIN_BIN uses the absolute directory of the plugin file instead of dirname-based resolution. Introduce _lets_zsh_plugin_refresh_completion that resolves the lets executable (configurable via LETS_EXECUTABLE), derives a signature from its path, --version output, and file mtime/size, and compares it to a stored signature file. Regenerate the _lets completion file and update a .lets-completion-signature file using temporary files and atomic mv when the signature changes or cache is missing, otherwise keep the existing cache. After successful refresh, unfunction the old _lets to force the shell to pick up the new completion definition, and clean up temporary files on failure paths. Invoke the refresh helper at plugin load and immediately unfunction the helper to avoid polluting the user namespace.	lets.plugin.zsh
Document automatic completion cache refresh semantics and how to trigger them after updating lets.	Explain that plugin-managed completions are refreshed automatically when the resolved lets executable, its metadata, or lets --version output changes. Document that users should reload their shell (e.g., exec $SHELL -l) after updating the lets binary to trigger a refresh. Fix the README to end with a newline character.	Readme.md
Add an automated zsh test that validates the completion cache is only regenerated when the lets binary, its version, or its file size changes.	Create an isolated temporary test environment with a fake plugin directory and fake lets binary on PATH. Implement a write_fake_lets helper that writes a stub lets script whose --version and completion -s zsh behaviors are controllable and increments a counter file on each completion invocation. Verify that sourcing the plugin the first time generates the completion file and increments the counter, re-sourcing without changes does not regenerate, and modifying the fake binary (version change or same version with different content/size) causes regeneration and counter increment. Provide assertion helpers for file contents and numeric values, plus cleanup and failure reporting utilities.	tests/refresh-completion-cache.zsh

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