Capture sources

Read wiki/governance/ before acting. Capture changes sources/ only; never create or update wiki concepts.

Workflow

1. Read wiki/governance/policy.md; honor its sensitivity levels and provider restrictions.

2. Classify the input, then run scripts/capture_source.py with the input and --vault <path>. Add --convert only when a Markdown extraction adds value:

   python3 scripts/capture_source.py <input-or-url> --vault <path> \
     --source-kind original --sensitivity private
   python3 scripts/capture_source.py <input-or-url> --vault <path> \
     --convert --verification partial