docs(citation): simplify repo metadata

[emmepra]

Summary

• shorten the public README citation section to a standard OSS shape
• remove README maintainer/process details that belong outside the repo landing page
• make both CITATION.cff and .zenodo.json institution-first using Icaro Lab

Scope

• in scope:
  • README cleanup
  • citation metadata cleanup
  • future Zenodo metadata cleanup
• out of scope:
  • code or runtime changes
  • release changes

Validation

• relevant tests/checks were run
• Docker/runtime validation was run when the change touched backend, orchestration, templates, or integration paths
• docs/rules were updated when behavior, contracts, or workflow changed

Commands run:

ruby -e "require 'yaml'; YAML.load_file('CITATION.cff'); puts 'CITATION.cff OK'"
python3 -c "import json; json.load(open('.zenodo.json')); print('.zenodo.json OK')"

Risks

• user-visible regressions: low; docs/metadata only
• operational/runtime risks: none expected
• follow-up work:
  • future Zenodo releases will now default to institutional creators

Evidence

• logs: local YAML/JSON parse validation
• screenshots: none
• related issues: none