Keep delegated history internal and add local-time display

[codeforester]

Goal

Make command history reflect the user-facing orchestration boundary consistently, while allowing users to choose UTC or local display time.

Background

The merged history UX records a primary row for public commands and retains delegated trace records. A nested basectl onboard invocation currently inherits the internal scope, but the Bash-side primary recorder hardcodes scope: primary, so delegated check, setup, doctor, projects, and trust calls can leak into the default view. onboard also does not propagate its selected project metadata, so basectl history --project base can hide the onboarding row. History timestamps are canonical UTC but the text header does not identify the timezone.

Scope

• Preserve the outer user invocation as the primary record.
• Mark recursively invoked basectl commands as internal and link them to the outer run.
• Propagate the selected onboarding project, root, and manifest where resolvable.
• Keep UTC as the canonical/default history timezone.
• Add basectl history --local-time for text/Markdown display in the host timezone.
• Label text/Markdown time columns explicitly as UTC or local.
• Keep JSON timestamps canonical ISO-8601 UTC; document the display-time behavior.
• Update help, completions, docs, and focused tests.

Acceptance Criteria

• basectl onboard <project> appears as one primary row with that project in the default history view.
• Onboard's delegated commands are absent from default history and present with --include-internal, carrying the parent run ID.
• Direct user invocations of check, setup, projects, etc. remain primary.
• basectl history labels timestamps as UTC.
• basectl history --local-time labels and renders text/Markdown timestamps in the local timezone.
• JSON output remains stable and UTC regardless of display-time selection.
• Existing history records remain readable.

Validation

• Focused history Python and Bash tests.
• Completion/help tests.
• Full ./bin/base-test and hosted CI.

Non-Goals

• Rewriting existing history records.
• Changing raw log timestamp policy.
• Adding arbitrary timezone selection beyond host local time.

Project Fields

• Status: Backlog
• Priority: P2
• Area: CLI
• Initiative: Contract Hardening
• Size: M

Agent Assignment

• Assignee: @codeforester