docs: add Signed commits section to CONTRIBUTING

[hyperpolymath]

Adds a Signed commits section to this repo's CONTRIBUTING, per owner ruling D218. The estate policy is docs/SIGNING-POLICY.adoc in hyperpolymath/standards.

This repo's default branch is covered by the zero-bypass Require-Signed-Commits ruleset, and rebase-merge is off. The section tells contributors what that requires:

• People and interactive agents sign with an SSH signing key.
• Apps, bots and workflows write through the API, so GitHub signs their commits.
• PRs are merged with squash.

If the file already had its own signing section, that section is replaced in place instead of adding a second one. Lines elsewhere that told people to sign with GPG are changed to match the policy (SSH for people).

This is a docs-only change. The commit was created through createCommitOnBranch, so GitHub signs it.

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CONTRIBUTING.adoc (1)

7-22: LGTM!

.github/CONTRIBUTING.md (1)

26-41: LGTM!

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Contributor guidance now requires commits reaching the default branch to be signed, and unsigned pushes are refused.
  • People and interactive agents must use a GitHub-registered SSH signing key and verified committer email. Apps, bots and workflows must create commits through the API or the approved signed-push action.
  • Pull requests must use squash merge. Unsigned commits require a new branch with signed cherry-picks, and rebase merge is disabled.

Walkthrough

The contribution guides now describe signed-commit requirements for the default branch, signing methods for people and automation, and merge instructions for pull requests.

Changes

Signed Commit Policy

Layer / File(s)	Summary
Document signed-commit requirements .github/CONTRIBUTING.md, CONTRIBUTING.adoc	Both guides require signed commits on the default branch. They describe signing requirements for people and interactive agents, API or estate action workflows for automation, squash merges, and how to handle unsigned commits. They also state that rebase-merge is disabled.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to c55e5

The guides describe the current signed-commit and merge workflow, and no actionable merge risk remains. The PR is ready to merge subject to normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the documentation change to add a Signed commits section to CONTRIBUTING.
Description check	✅ Passed	The description directly explains the signed-commit guidance, policy basis, merge requirements, and documentation-only scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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_{A rabbit checks each signed commit,
Then hops through guidance, line by line.
SSH keys mark the path ahead,
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