added optimized auto completion script

[sker65]

Greptile Summary

Added optimized zsh completion script that implements context-aware caching and intelligent fallback to file completion. The script caches completions per test target and subcommand, with automatic background refresh after 1 minute, significantly improving tab completion performance.

• Created new completion script at scripts/octomind.zsh with caching mechanism
• Implemented context-sensitive caching based on testTargetId from config file
• Added fallback to standard file completion when no CLI completions available
• Background cache refresh prevents blocking on stale cache

Confidence Score: 4/5

• This PR is safe to merge with one syntax fix required
• The implementation is well-structured with clear caching logic and good fallback behavior. However, there is a syntax error in the grep pattern on line 41 (missing closing quote) that will cause the context_id extraction to fail. Once fixed, the script should work correctly.
• Pay attention to line 41 in scripts/octomind.zsh - the regex pattern needs a closing quote

Important Files Changed

Filename	Overview
scripts/octomind.zsh	Added optimized zsh completion script with context-aware caching and intelligent fallback to file completion

Sequence Diagram

sequenceDiagram
    participant User
    participant Shell as Zsh Shell
    participant Script as _fast_octomind_completion
    participant Cache as Cache File
    participant CLI as octomind CLI

    User->>Shell: Press TAB for completion
    Shell->>Script: Invoke completion function
    Script->>Script: Extract context_id from config
    Script->>Script: Determine cache file path
    
    alt Cache exists and is valid
        Script->>Cache: Read cached completions
        Cache-->>Script: Return completions
        Script->>Shell: Display completions
        
        alt Cache older than 1 minute
            Script->>CLI: Refresh cache in background
            CLI-->>Cache: Update cache file
        end
    else No cache or empty cache
        Script->>CLI: Request completions (blocking)
        CLI-->>Script: Return completions
        Script->>Cache: Write completions to cache
        Script->>Shell: Display completions
    end
    
    alt No CLI completions available
        Script->>Shell: Fallback to file completion
    end
    
    Shell-->>User: Show completion options

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[fabianboth]

the grep could yield empty or multiple, maybe we should safeguard?