Tighten basectl doctor text formatting

[codeforester]

Summary

• remove redundant blank lines around doctor runtime findings and final summaries
• align Fix: continuation lines with the finding ID column in visual and plain text modes
• emit Base doctor and CI doctor final summaries through the INFO logger
• add regression assertions for runtime spacing, continuation indentation, and INFO summaries

Closes #1723

Validation

• env -u BASE_HOME BASE_BASH_LIBS_DIR=/Users/rameshhp/work/base-bash-libs/lib/bash bats -t cli/bash/commands/basectl/tests/doctor.bats cli/bash/commands/basectl/tests/ci.bats (41 passed)
• env -u BASE_HOME BASE_BASH_LIBS_DIR=/Users/rameshhp/work/base-bash-libs/lib/bash bats -t tests/integration/base_workflows.bats (7 passed)
• shellcheck cli/bash/commands/basectl/subcommands/doctor.sh
• shellcheck -e SC1091 cli/bash/commands/basectl/subcommands/setup_common.sh
• bash -n cli/bash/commands/basectl/subcommands/doctor.sh cli/bash/commands/basectl/subcommands/setup_common.sh
• git diff --check

AI context was left unchanged because this is output-only polish with no command, architecture, or workflow contract change.