ci: use positive include patterns in paths-filter for required check compatibility

[Aaron ("AJ") Steers (aaronsteers)]

Summary

Fixes the dorny/paths-filter configuration in the check-paths job so that docs-only PRs correctly skip the "Validate Generation (Dry Run)" required check.

The previous configuration used a catch-all '**' with negated exclusions ('!docs/**', etc.). Due to dorny/paths-filter's OR semantics, every changed file matched at least one negation pattern, causing generation=true on every PR — including docs-only ones. Execution log showing the bug.

This PR replaces the exclusion patterns with explicit positive includes for paths that actually affect generation: scripts/**, gen.yaml, gen.lock, .speakeasy/**, .github/**, internal/**, go.mod, go.sum, main.go, provider/**.

Review & Testing Checklist for Human

• Is the include list complete? If any path that affects Speakeasy generation is missing, the validate job will be incorrectly skipped for PRs touching that path. Cross-check against what generate-command.yml actually reads/writes.
• Test on a docs-only PR (like #321) — the check-paths job should output should_run=false and the validate job should be skipped (reported as "skipped", not "pending").
• Test on a real code PR — confirm the validate job still runs when non-docs files change.

Notes

• Requested by Aaron ("AJ") Steers (@aaronsteers)
• Devin session

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