fix(ci): stop profile deploys overwriting wiki

[ss-o]

Summary

• Remove the obsolete Cloudflare Pages deployment workflow from z-shell/.github.
• Keep z-shell/wiki as the sole configured deployment owner for Cloudflare Pages project zsh.
• Prevent future .github pushes from replacing the wiki with the Markdown-only organization profile.

Root cause

The wiki first configured project zsh on 17 December 2022. The .github workflow was added later, on 12 March 2023, already hard-coded to the same project. It had no previous project name.

The collision remained dormant while .github deployments failed before reaching Cloudflare. PR #443 removed the failing pnpm build path, and run 27410691451 on 12 June 2026 became the first retained successful profile deployment to zsh. Run 30406990541 repeated the overwrite and left the production aliases returning 404.

A wiki workflow dispatch, run 30424725252, has restored production. Deleting this workflow removes the conflicting publisher without inventing or creating an unverified replacement Cloudflare project.

Verification

• python3 -B scripts/validate-agent-policy.py
• python3 -B -m unittest scripts/test_validate_agent_policy.py (69 tests)
• git diff --check origin/main..HEAD
• Boundary scan confirms no remaining z-shell/.github workflow targets project zsh
• z-shell/wiki remains configured to deploy build to project zsh
• wiki.zshell.dev and zsh.pages.dev return HTTP 200 after the restoring wiki deployment

Closes #490

[Copilot]

Pull request overview

This PR removes the obsolete Cloudflare Pages deployment workflow from z-shell/.github to ensure this repository can no longer publish to the zsh Pages project (which is owned by z-shell/wiki), preventing future overwrites of the live wiki site.

Changes:

• Deleted .github/workflows/pages-deployment.yml, which deployed the org profile (profile/) to Cloudflare Pages project zsh.
• Eliminated the only in-repo reference to cloudflare/pages-action / projectName: "zsh" (verified via repo search).