Improve shell completion docs and avoid full init for completion probes - #25693

Hey! Your PR title Improve shell completion docs and avoid full init for completion probes doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

The following comment was made by an LLM, it may be inaccurate:

Based on my searches, I found one potentially related PR:

PR #23263: feat: add fish shell tab completions
#23263

This PR is related as it also deals with shell completion functionality for the opencode CLI. However, it appears to focus specifically on adding fish shell completions, while the current PR (25693) is about improving documentation and optimizing the completion invocation path for Bash/Zsh. These PRs address different aspects of shell completion functionality and are not duplicates.

No duplicate PRs found

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