breadclip: document pin verb, config file, and ignore rules

- EVENTS.md: `bread.command.clip.pin` and `bread.clip.pinned` /
  `.pin.failed` are now implemented; `select` stays explicitly not
  implemented with the reason. AGENTS.md follows.
- README: Configuration section, Ctrl+P bind, updated privacy notes
  (CLIPBOARD_STATE + ignore rules), JPEG image entries, primary badge.
- check.yml also runs on pushes to `main` — a push to main triggers a
  dev-track release build, so it should be linted/tested first.
- release.yml uses `${GITHUB_REPOSITORY}` instead of a hard-coded
  `Breadway/breadclip` for the GitHub mirror release upload.

.forgejo/workflows/release.yml

@@ -64,9 +64,9 @@ jobs:
           set -euo pipefail
           VERSION="${GITHUB_REF_NAME#v}"
           PKG_DIR="/srv/breadway-dl/breadclip/${VERSION}"
-          gh release create "${GITHUB_REF_NAME}" --repo Breadway/breadclip \
+          gh release create "${GITHUB_REF_NAME}" --repo "${GITHUB_REPOSITORY}" \
             --title "breadclip v${VERSION}" --generate-notes 2>/dev/null || true
-          gh release upload "${GITHUB_REF_NAME}" --repo Breadway/breadclip \
+          gh release upload "${GITHUB_REF_NAME}" --repo "${GITHUB_REPOSITORY}" \
             "${PKG_DIR}/breadclip-x86_64" \
             "${PKG_DIR}/breadclipd-x86_64" \
             "${PKG_DIR}/breadclip-x86_64.sha256" \