Refactor plugin and README for documentation skills; add doc-docker and doc-funcs skills

skills/doc-docker/scripts/awk/align_col.awk

@@ -0,0 +1,9 @@
+!/^[[:space:]]*#/ && /  #/ {
+    idx = index($0, "  #")
+    if (idx > 0 && idx != TARGET) {
+        pad = ""
+        for (i = idx; i < TARGET; i++) pad = pad " "
+        sub(/  #/, pad "  #")
+    }
+}
+{ print }

skills/doc-docker/scripts/awk/find_col.awk

@@ -0,0 +1,8 @@
+!/^[[:space:]]*#/ && /  #/ {
+    idx = index($0, "  #")
+    content = substr($0, 1, idx - 1)
+    gsub(/ +$/, "", content)
+    col = length(content) + 2
+    if (col > max_col) max_col = col
+}
+END { print "max_col=" max_col }

skills/doc-docker/scripts/awk/strip_col.awk

@@ -0,0 +1,8 @@
+!/^[[:space:]]*#/ && /  #/ {
+    idx = index($0, "  #")
+    content = substr($0, 1, idx - 1)
+    gsub(/ +$/, "", content)
+    comment = substr($0, idx)
+    $0 = content comment
+}
+{ print }

skills/doc-docker/scripts/awk/verify_col.awk

@@ -0,0 +1,4 @@
+!/^[[:space:]]*#/ && /  #/ {
+    idx = index($0, "  #")
+    if (idx != TARGET) print NR, "col=" idx, substr($0, 1, 80)
+}