fix: regression workflow flag ordering, source path, and input validation

[gontzess]

Summary

• Fix flag ordering: move flags before the positional arg so Go's flag.Parse sees them
• Fix --source path: checkout connector to path: ${{ inputs.connector }} (e.g., baton-mysql) instead of generic connector, so the tool derives the correct config name from the directory basename
• Add input validation: reject connector names that don't match ^baton-[a-zA-Z0-9_-]+$

Context

The verify step was invoked as verify mysql --binary ./bin/baton-mysql .... Go's flag.Parse stops at the first non-flag argument, so all flags after mysql were silently ignored. The tool fell back to binary_path from the config file (~/repo/baton-mysql/dist/...), a local dev path that doesn't exist in CI.

The --source path was ../connector (the checkout directory name), causing filepath.Base to derive config name connector instead of mysql.

Verified

Tested on baton-mysql PR #24 — regression job passes with full coverage:

Axiom Coverage: 100.0% (10/10 target predicates)
Branch Coverage: 87.4% (334/382 unique branches)
Fact Coverage: 100.0% (43/43 expected facts)

Test plan

• Test PR on baton-mysql with branch ref — regression passes with code coverage
• After merge, update v4 tag

[coderabbitai]

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