Tighten basectl doctor text output formatting

[codeforester]

Goal

Polish the human-readable basectl doctor output after the shared text-rendering changes.

Background

A verbose project doctor run currently leaves an extra blank line after the runtime-chain log, prints finding fixes at the left margin instead of under the finding message column, and separates the final blocking-issue summary from the findings with another blank line. The summary is also emitted as an unstructured line rather than an INFO log.

Scope

• Remove the blank line between the final runtime-chain INFO entry and the first doctor finding.
• Align Fix: continuation lines with the finding message column in both visual and no-color text modes.
• Remove the blank line before the final summary.
• Emit the final Base doctor and CI doctor summaries through the INFO logger, preserving wording, status, and exit codes.
• Add focused BATS coverage for spacing, fix indentation, and INFO-level summary output.

Acceptance criteria

• Verbose doctor output has no blank line after the last runtime-chain entry.
• A finding fix begins under the finding message column rather than at the left margin.
• The final summary immediately follows the last finding/fix line.
• The final summary is timestamped and labeled INFO.
• Successful and failing doctor paths, CI text mode, JSON mode, color/no-color behavior, and exit codes remain correct.

Non-goals

• No changes to finding IDs, messages, remediation text, JSON output, or diagnostic policy.
• No changes to setup runtime-chain content or log levels other than the final text summary.

Project fields

Status: In Progress
Priority: P2
Area: CLI
Initiative: Adoption Polish
Size: S
Milestone: v1.8.0

Agent assignment

Implementation and verification: codeforester.

[codeforester]

Clarification for the continuation-line criterion: Fix: should align with the finding ID (the second visible column), accounting for the wider visual status label when color/symbol output is enabled. The message text and JSON contracts remain unchanged.