perf: cache completion scripts in shell completion tests

[toiroakr]

Summary

• Pre-generate completion scripts once per shell in setupTestContext() / setupNestedTestContext() instead of spawning tsx/Node.js on every test invocation
• Each *Complete() helper now accepts an optional scriptPath to source from file instead of running eval "$(app completion shell)"
• Interactive test functions (zpty, expect, complete --do-complete) also use cached scripts

This eliminates ~500-1500ms tsx/Node.js startup overhead per test call, reducing fish tests from ~44s to ~6s, zsh from ~94s to ~37s, and bash from ~121s to ~64s. Fixes intermittent CI timeouts in shell completion tests.

Code Metrics Report

	main (3bebf51)	#166 (3953751)	+/-
Coverage	88.6%	88.6%	0.0%
Test Execution Time	50s	42s	-8s

Details

  |                     | main (3bebf51) | #166 (3953751) | +/-  |
  |---------------------|----------------|----------------|------|
  | Coverage            |          88.6% |          88.6% | 0.0% |
  |   Files             |             41 |             41 |    0 |
  |   Lines             |           3164 |           3164 |    0 |
  |   Covered           |           2804 |           2804 |    0 |
+ | Test Execution Time |            50s |            42s |  -8s |

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Reported by octocov

[Copilot]

Pull request overview

Improves shell completion test performance by generating each shell’s completion script once per test context and reusing it across all completion helper calls and interactive completion tests, avoiding repeated Node/tsx startup.

Changes:

• Add completionScripts (bash/zsh/fish) to the shell test context and generate scripts during setupTestContext() / setupNestedTestContext().
• Update bash/zsh/fish completion helpers to optionally source a cached script file via scriptPath instead of running eval "$(app completion ...)" each time.
• Update interactive completion tests (bash/expect, zsh/zpty, fish/complete --do-complete) to source cached scripts.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/shell-completion/helpers.ts	Generates and stores cached completion scripts; adds scriptPath support to completion helpers.
tests/shell-completion/bash.test.ts	Uses cached bash completion script for raw and interactive completion tests.
tests/shell-completion/zsh.test.ts	Uses cached zsh completion script for raw and zpty-based interactive completion tests.
tests/shell-completion/fish.test.ts	Uses cached fish completion script for raw and complete --do-complete interactive tests.

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