Fix mrindex --start-uuid flag not being recognized

[ericnewcomer]

Summary

• mrindex --start-uuid was broken because LoadConfig (via ezconf) parses os.Args first and rejects unknown flags before mrindex's own flag parser runs
• Fix moves mrindex's flag parsing before LoadConfig and strips custom flags from os.Args so ezconf only sees args it understands

Test plan

• Run mrindex --start-uuid=<uuid> contacts and verify it no longer errors with "flag provided but not defined"
• Run mrindex contacts and mrindex messages without --start-uuid to verify they still work

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes mrindex --start-uuid being rejected during startup because runtime.LoadConfig (via ezconf) parses os.Args and errors on unknown flags before mrindex’s own flag parsing runs.

Changes:

• Parses mrindex-specific flags (--start-uuid) before calling runtime.LoadConfig.
• Strips mrindex-specific flags from os.Args so ezconf only sees arguments it understands.

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[Copilot]

Parsing os.Args[1:] with a FlagSet that only defines --start-uuid will exit on any of the runtime/ezconf config flags (e.g. --db, --log-level, --help), which are documented as supported command-line parameters and are exercised in runtime.LoadConfig tests. This change fixes --start-uuid but introduces a regression where mrindex can no longer accept config flags. Prefer extracting/removing just the --start-uuid option from the args (e.g. via a small pre-scan that handles both --start-uuid=... and --start-uuid ...) while leaving all other args intact for LoadConfig, or call runtime.LoadConfig(filteredArgs...) without invoking flag.Parse on the full argument list upfront.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.43%. Comparing base (485e448) to head (0478c9a).

Files with missing lines	Patch %	Lines
cmd/index.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1045      +/-   ##
==========================================
- Coverage   52.44%   52.43%   -0.01%     
==========================================
  Files         275      275              
  Lines       12684    12685       +1     
==========================================
  Hits         6652     6652              
- Misses       5189     5190       +1     
  Partials      843      843              

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