chore: improve tooling quality and docs

- close_issue.sh: add set -euo pipefail, argument validation, confirmation output
- mark_issue.sh: track previously untracked claim/release script
- create_pr.sh: remove hardcoded one-off (use create_pr.py instead)
- README.md: reflect current toolset with usage examples
- .gitignore: ignore venv/ and __pycache__/

close_issue.sh

@@ -1,15 +1,27 @@
 #!/usr/bin/env bash
+# Close a Gitea issue by setting its state to "closed".
+#
+# Usage:  ./close_issue.sh <issue_number>
+#
+# Auth: macOS keychain via `git credential fill` (same as the other scripts).
+set -euo pipefail
+
 HOST="gitea.dadeschools.net"
 API="https://$HOST/api/v1"
 ORG="Contractor"
 REPO="Timesheet"
-ISSUE_NUM=$1
+
+ISSUE_NUM="${1:?usage: close_issue.sh <issue_number>}"
 
 CREDS=$(printf "host=%s\nprotocol=https\n\n" "$HOST" | git credential fill)
 USER=$(printf '%s\n' "$CREDS" | sed -n 's/^username=//p')
 PASS=$(printf '%s\n' "$CREDS" | sed -n 's/^password=//p')
 
-AUTH=(-u "$USER:$PASS")
-PAYLOAD='{"state": "closed"}'
+curl -sSL -X PATCH \
+  -u "$USER:$PASS" \
+  -H "Content-Type: application/json" \
+  -d '{"state": "closed"}' \
+  "$API/repos/$ORG/$REPO/issues/$ISSUE_NUM"
 
-curl -sSL -X PATCH "${AUTH[@]}" -H "Content-Type: application/json" -d "$PAYLOAD" "$API/repos/$ORG/$REPO/issues/$ISSUE_NUM"
+echo ""
+echo "#$ISSUE_NUM closed"