chore(engine): polish Go comments per project style

Nikolay Samokhvalovrequested to merge
cleanup/comments-godoc-polish into master

Comment-only changes; no code/behavior changes.

  • Lowercase non-godoc inline comments per CLAUDE.md style guide across cli/main.go, cli/commands/{branch,config,port_forwarding}, provision/{docker.go, runners.go, databases/postgres/postgres_mgmt.go}.
  • Fix typo and grammar in godoc for tools.CreateContainerIfMissing ('exits returns existing' -> 'an existing container ID is returned').

Validation: gofmt clean, go vet ./... clean (only a third-party C deprecation warning in github.com/shirou/gopsutil), go build ./... ok.

Signed-off-by: Nikolay Samokhvalov nik@postgres.ai

Closes #715 (closed)

Edited by Maya P

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