chore: finish the Guard-Core org migration (docs, metadata, links)

[rennf93]

Summary

Finishes the Guard-Core org migration for everything the workflow/OIDC pass (#29) did not cover: documentation, metadata, links and contact addresses.

Categories

• Docs links: README hero, badges, ecosystem tables, docs/index.md, docs/llms.txt, docs/robots.txt, SECURITY.md, docs/tutorial pages, SKILL.md, AGENTS.md, CLAUDE.md, mkdocs.yml (site_url, repo_url, social, feedback, og:image) now point at github.com/Guard-Core and guard-core.github.io with path suffixes preserved
• Container paths: ghcr.io/rennf93/flaskapi-guard-example -> ghcr.io/guard-core/flaskapi-guard-example in docs/index.md and the org packages URL; bump_version.py docker pull regex updated to match
• Workflows: docs.yml and release.yml action refs (github-actions-secrets-mgmt, upsert-context7) moved to Guard-Core
• Metadata: pyproject.toml Homepage pointed at the org and the missing Documentation, Repository, Issues and Changelog project.urls entries added; author email set to rennf93@guard-core.com; FUNDING.yml github target set to Guard-Core (tidelift and paypal lines kept)
• Contacts: CODE_OF_CONDUCT enforcement contact and README author mailto set to contact@guard-core.com
• Branch bug fixes: mkdocs.yml edit_uri edit/main/docs/ -> edit/master/docs/, docs/llms.txt contributing link blob/main -> blob/master

Deliberately untouched

• CHANGELOG.md and docs/release-notes.md historical references (6 hits)
• mkdocs.yml author url (personal profile)

Verification

• git grep -n rennf93: 163 before -> 8 after, the 8 being the 6 CHANGELOG/release-notes history hits, the mkdocs author profile url and the pyproject author email prefix rennf93@guard-core.com (both intentional per the migration rules)
• uv run ruff format --check + ruff check on touched files: pass
• mypy: 306 pre-existing errors before and after (identical baseline, no new errors)
• mkdocs build: exit 0, no errors, no warnings
• pyproject.toml parses via tomllib: OK
• Commit GPG-signed, git log --format=%G? = G

Counts

• 18 files changed, 161 insertions, 157 deletions
• rennf93 references: 163 line hits before, 6 intentional history hits remain

[github-actions]

Thanks for opening your first pull request on flaskapi-guard!

Quick checklist before review (most of these are enforced by CI, but worth a glance):

• make lint — ruff format, ruff check, mypy, and vulture
• make test (or make local-test) — full test suite passes with 100% coverage
• make security — bandit, safety, and pip-audit all clean
• make quality — radon and xenon complexity thresholds respected
• No # noqa / # type: ignore shortcuts; pre-existing violations in touched files are fixed
• Added an entry under ## Unreleased in CHANGELOG.md
• If you touched a public API, updated the relevant page under docs/
• If the change involves engine logic, the corresponding fix landed in guard-core first

See CONTRIBUTING.md for the full workflow and the Code of Conduct for the community standards we follow.

Welcome aboard — a maintainer will review shortly.