chore: fill or remove RSR template placeholders

[hyperpolymath]

openssf-compliance.yml fails when any of the thirteen files it checks still contains a {{PLACEHOLDER}} token. This clears them, with no invention.

• Deleted the TEMPLATE INSTRUCTIONS (delete this block before publishing) comment — the template says to delete it, and it is where every legend line lived, so a large share of the reported tokens were the file documenting its own placeholders.
• Filled what the repository itself supplies: owner and repo from the git remote, project name, year, forge, main branch, contact email.
• Removed PGP and website lines. https://github.com/<user>.gpg returns HTTP 200 for every account; with no key uploaded the body is a stub reading "This user hasn't uploaded any GPG keys". No key is published for either account, and commit signing here is SSH — unrelated. The template sanctions this: "Optional: Remove sections that don't apply (e.g. PGP if you don't use it)."\n\nA security policy telling a researcher to encrypt to a key that does not exist is worse than one that does not mention encryption.\n\nWhere applicable, this also fixes a misrouted advisory URL. A previous just init copied already-filled templates out of squisher-corpus, so 51 repositories directed vulnerability reports to hyperpolymath/squisher-corpus — a repository unrelated to the code being reported, meaning the affected maintainer never saw them. Repointed from this repository's own git remote.