fix: offer parent flags in Bash and PowerShell completions when subcommands exist

[TabishB]

Summary

• Fixed Bash and PowerShell completion generators to offer parent-level flags when commands have both flags and subcommands
• When the user types input starting with -, parent flags are now suggested instead of only showing subcommands
• Added tests for the new behavior in both generators

Before: openspec config --<TAB> → Only showed subcommands (set, get, list)
After: openspec config --<TAB> → Shows parent flags (--scope, -s, --json) when input starts with -

Fixes #463

Test plan

• New tests verify parent flags are offered when command has both flags and subcommands
• All 881 existing tests pass
• Build succeeds with no type errors

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 504c93b and 2fa07b9.

📒 Files selected for processing (4)

• src/core/completions/generators/bash-generator.ts
• src/core/completions/generators/powershell-generator.ts
• test/core/completions/generators/bash-generator.test.ts
• test/core/completions/generators/powershell-generator.test.ts

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