Fix recursive history scope and local time display

[codeforester]

Summary

• keep nested basectl calls internal in the history index instead of promoting them to primary rows
• attach onboard primary records to the selected project, resolving root and manifest when available
• add basectl history --local-time for text and Markdown while preserving UTC JSON timestamps
• label history time columns with their timezone and update help, completions, docs, and tests

Closes #1673

Validation

• focused history/onboarding/completion BATS suites
• focused history Python tests
• ./bin/base-test (1007 passed, 1 skipped)
• ShellCheck and git diff --check