fix: use Woodpecker v3 numeric repo IDs in API calls

Woodpecker v3 requires numeric repo IDs in API endpoints, not
owner/repo path segments. The old paths hit the SPA frontend
catch-all and return HTML, which downstream tools misinterpret
as auth failure (401).

- Add tools/woodpecker/_lib.sh with wp_resolve_repo_id() helper
  that calls /api/repos/lookup/{owner}/{repo} to get numeric ID
- Update all 3 pipeline scripts to resolve repo ID before API calls

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/woodpecker/_lib.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+#
+# _lib.sh — Shared helpers for Woodpecker CI tool scripts
+#
+# Usage: source "$(dirname "${BASH_SOURCE[0]}")/_lib.sh"
+#
+# Requires: WOODPECKER_URL and WOODPECKER_TOKEN to be set (via load_credentials)
+
+# Resolve owner/repo name to numeric repo ID (required by Woodpecker v3 API)
+# Usage: REPO_ID=$(wp_resolve_repo_id "owner/repo")
+wp_resolve_repo_id() {
+  local full_name="$1"
+  local response http_code body repo_id
+
+  response=$(curl -sk -w "\n%{http_code}" \
+    -H "Authorization: Bearer $WOODPECKER_TOKEN" \
+    "${WOODPECKER_URL}/api/repos/lookup/${full_name}")
+
+  http_code=$(echo "$response" | tail -n1)
+  body=$(echo "$response" | sed '$d')
+
+  if [[ "$http_code" != "200" ]]; then
+    echo "Error: Failed to look up repo '${full_name}' (HTTP $http_code)" >&2
+    if echo "$body" | jq -e '.message' &>/dev/null; then
+      echo "  $(echo "$body" | jq -r '.message')" >&2
+    fi
+    return 1
+  fi
+
+  repo_id=$(echo "$body" | jq -r '.id // empty')
+  if [[ -z "$repo_id" ]]; then
+    echo "Error: Repo lookup returned no ID for '${full_name}'" >&2
+    return 1
+  fi
+
+  echo "$repo_id"
+}
+
+# Auto-detect repo name from git remote origin
+# Usage: REPO=$(wp_detect_repo)
+wp_detect_repo() {
+  local remote_url
+  remote_url=$(git remote get-url origin 2>/dev/null || true)
+  if [[ -n "$remote_url" ]]; then
+    echo "$remote_url" | sed -E 's|.*[:/]([^/]+/[^/]+?)(\.git)?$|\1|'
+  else
+    echo "Error: -r owner/repo required (not in a git repository)" >&2
+    return 1
+  fi
+}