refactor(app): isolate local command dispatch

[dcavalcante]

Summary

This separates client-side command dispatch from the main execution path.

Previously, app.go contained both the local command registry and its lookup logic. This change moves those responsibilities into local_commands.go, leaving execute focused on deciding whether an input should be handled locally or passed to the existing meta-command and SQL execution paths.

The existing \clear command is used to establish this boundary. Its handler, logging, prompt handling, and exact-match behavior remain unchanged.

Changes

• move the local command registry out of app.go
• introduce runLocal as the local command lookup and dispatch entry point
• keep prompt wrapping and logging in the existing execution flow
• add regression tests for \clear dispatch and exact command matching

Behavior

This is a structural refactor with no intended user-facing changes.

Testing

• go test ./...
• go vet ./...
• golangci-lint run

[Copilot]

Pull request overview

This PR refactors the internal/app execution path by extracting local (client-side) command lookup/dispatch out of app.go into a dedicated local_commands.go, keeping execute focused on routing input to local commands vs meta-commands vs SQL execution.

Changes:

• Moved the local command registry (currently \clear) into internal/app/local_commands.go.
• Added (*pgxCLI).runLocal(query) as the single entry point for exact-match local command dispatch.
• Added regression tests to confirm exact-match behavior for \clear and non-matching variants.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
internal/app/local_commands.go	Introduces the local command registry and runLocal dispatch method.
internal/app/local_commands_test.go	Adds tests to ensure runLocal matches \clear exactly and rejects similar inputs.
internal/app/app.go	Switches local command execution to use p.runLocal(query) and preserves prompt-wrapping behavior.

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[balajz]

Looks great, thanks for working on this!