refactor(includes): R12 下标 while 循环改 for range，R13 c.Set 迁移为赋值

R12（wiki/新规范 L27-39）：把「i: int = 0 与 while i < N: … i += 1」形式的下标循环改写为「for i in range(N):」。保守判定：仅当条件为裸 NAME < EXPR、循环体无 continue、NAME 在体内无其它赋值、无嵌套重绑定、循环后同层不再引用 NAME 时才改写。共 269 处 / 48 文件。

R13：c.Set 是正在退化的路径——c.Set(*p, v) 期望写作 *p = v，c.Set(a, b) 等于 a = b。本次把 includes 内 45 处 c.Set 全部迁移为赋值，includes 已无 c.Set 调用。

验证：bootstrap 三重重编 SUCCESS（无 vast_c 解析回退）；全量 77/77 顺序回归通过；ZlibTest 内部断言 79 passed / 0 failed。

requests/https.vp

@@ -76,10 +76,8 @@ def stream_pull(out: str, cap: INT) -> INT:
         avail = INT(_st_len - _st_consumed)
     if avail > cap - 1:
         avail = cap - 1
-    i: sizet = 0
-    while i < sizet(avail):
+    for i in range(sizet(avail)):
         out[i] = _st_buf[_st_consumed + i]
-        i += 1
     out[sizet(avail)] = 0
     _st_consumed += sizet(avail)
     return avail
@@ -503,8 +501,7 @@ def _HttpsRedirectLoop(method: str, url: str, verify: bool, ca_file: str, data:
         return None
     string.strcpy(cur, url)
 
-    hop: INT = 0
-    while hop < 5:
+    for hop in range(5):
         resp: rawptr[requests.Response] = _HttpsRequest(method, cur, verify, ca_file, data, content_type, auth)
         if resp is None:
             requests._mbuddy.free(cur)
@@ -549,7 +546,6 @@ def _HttpsRedirectLoop(method: str, url: str, verify: bool, ca_file: str, data:
         requests._mbuddy.free(loc)
         requests._mbuddy.free(cur)
         cur = nxt
-        hop += 1
 
     _RecordErrorText("too many redirects")
     requests._mbuddy.free(cur)
@@ -843,12 +839,10 @@ def post_stream(url: str, data: str, content_type: str = "application/json",
         while True:
             # 找行尾 \n
             nl: INT = -1
-            k: INT = 0
-            while k < llen:
+            for k in range(llen):
                 if leftover[k] == 10:
                     nl = k
                     break
-                k += 1
             if nl < 0:
                 break
             e: INT = nl
@@ -886,10 +880,8 @@ def post_stream(url: str, data: str, content_type: str = "application/json",
                                     _StreamAppendContent(dtx)
             # 3) 移除已处理行
             rem: INT = llen - (nl + 1)
-            j2: INT = 0
-            while j2 < rem:
+            for j2 in range(rem):
                 leftover[j2] = leftover[nl + 1 + j2]
-                j2 += 1
             llen = rem
 
     # ---- 收尾 ----
@@ -938,8 +930,8 @@ def _DlOnce(url: str, start: sizet, count: INT, verify: bool, ca_file: str,
     if url is None or dst is None or dst_cap <= 0 \
             or out_status is None or out_total is None:
         return -1
-    c.Set(*out_status, 0)
-    c.Set(*out_total, 0)
+    *out_status = 0
+    *out_total = 0
     if out_loc is not None and out_loccap > 0:
         out_loc[0] = 0
     _last_verify_flag = 1 if verify else 0
@@ -1064,7 +1056,7 @@ def _DlOnce(url: str, start: sizet, count: INT, verify: bool, ca_file: str,
     dst[total] = 0
 
     st: INT = requests._StatusRaw(dst)
-    c.Set(*out_status, st)
+    *out_status = st
     if st == 0:
         _RecordErrorText("empty response")
         return -3
@@ -1078,11 +1070,11 @@ def _DlOnce(url: str, start: sizet, count: INT, verify: bool, ca_file: str,
         return -3
 
     if st == 206:
-        c.Set(*out_total, requests._CRTotalOf(dst, total))
+        *out_total = requests._CRTotalOf(dst, total)
     else:
         cl2: INT = requests._CLenOf(dst, total)
         if cl2 > 0:
-            c.Set(*out_total, sizet(cl2))
+            *out_total = sizet(cl2)
     bo: INT = requests._FindBodyStart(dst, total)
     if bo < 0 or bo >= total:
         return 0