council.py: review every candidate in a folder in one run

[Aetherneum-linework]

Today council/council.py takes a single dossier path. Reviewing a whole cohort should be one command.

What to do:

• Accept a directory: python council/council.py council/candidates/
• Iterate every *.md, run the Council on each, write the per-reviewer JSONs as today
• Print a one-line quorum summary per candidate at the end

Success looks like: a maintainer can score an entire intake folder with one command.