diff --git a/AGENTS.md b/AGENTS.md
index cb986862..8f62b4cb 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -92,8 +92,10 @@
 
 ## 6. 代码增长冻结
 
-- `scripts/jyotish_api_server.py` must not grow. New endpoints and features go in dedicated modules under `scripts/` and are thinly registered from the main file. Do not add new handler bodies, workflows, or feature branches to this file. The cap is enforced by `tests/test_api_server_growth_contract.py`（冻结时行数 + 300 行 bugfix 余量）。
-- `frontend/src/app/page.tsx` 已从 4,766 行拆到 2,000 行以下，**不得再增长**：新逻辑进 `frontend/src/hooks/`、`frontend/src/lib/` 或组件；参数式 hook 内部保持 0 个 React hook 的既定模式。
+行数是耦合的影子：盯行数时，`Home()` 的状态数和 `JyotishAPIHandler` 的类方法数仍在涨。主门换成耦合指标，行数只作粗护栏。
+
+- `scripts/jyotish_api_server.py` must not grow. New endpoints and features go in dedicated modules under `scripts/` and are thinly registered from the main file. Do not add new handler bodies, workflows, or feature branches to this file. The live gate is `tests/test_api_server_growth_contract.py`：**类方法数不得增长、`JyotishAPIHandler.__new__` 伪造点不得增长**；行数是粗护栏（开工实测基线 + 300）。
+- `frontend/src/app/page.tsx`：`Home()` 的 `useState` / `useRef` 数不得增长。新逻辑进 `frontend/src/hooks/`、`frontend/src/lib/` 或组件；抽出去的 hook 与子组件应当持有自己的状态，`page.tsx` 只做装配。行数是粗护栏（开工实测基线 + 150），由 `frontend/tests/home-shell-growth-contract.test.ts` 执行。
 - 不得再手写第二个聊天输入框（一律 `ChatComposer`，自有草稿走 `value`）、第二套滚动跟随（一律 `useConversationScrollAnchor` + `JumpToLatestButton`）、第二套加载动画（揭幕后不得出现 spinner / 骨架 / "正在加载"，流式生成中除外）。
 
 ## 7. 前端红线
diff --git a/docs/tasks/PROGRESS-freeze-metric-change-20260915.md b/docs/tasks/PROGRESS-freeze-metric-change-20260915.md
new file mode 100644
index 00000000..7abb7a93
--- /dev/null
+++ b/docs/tasks/PROGRESS-freeze-metric-change-20260915.md
@@ -0,0 +1,94 @@
+# PROGRESS · 增长冻结改盯耦合（2026-09-16）
+
+工作树：`.worktrees/freeze-metric-change-20260915`  
+分支：`codex/freeze-metric-change-20260915`  
+任务书基线写 `6b3248bf`；开工时 `origin/staging` = **`51a65d92`**（含 BUG-732）。  
+本机 Windows。无 Docker。本单不占 BUG 号，不改 `CHANGELOG.md` / `BUG_HISTORY.md` / `docs/tasks/README.md`。  
+`page.tsx` 与 `scripts/jyotish_api_server.py` **一行未动**（反向验证后已 `git checkout` 还原）。
+
+## 开工实测基线（2026-09-16，`51a65d92`）
+
+禁止抄任务书 1951 / 66 / 41 / 11334 / 225。下列数字全部本机现测。
+
+| 组 | 指标 | 数法 | 实测 | 新门 |
+| --- | --- | --- | ---: | --- |
+| 1 | `frontend/src/app/page.tsx` 行数 | `Path.read_bytes().count(b"\n")`，与 `(source.match(/\n/g) ?? []).length` 相同 | **1951** | 粗护栏 ≤ 1951 + 150 = 2101 |
+| 2a | `Home()` `useState` | `\buseState[<(]`（含 `useState<Type>(`） | **66** | 主门，不得增长 |
+| 2b | `Home()` `useRef` | `\buseRef[<(]` | **41** | 主门，不得增长 |
+| 3 | `scripts/jyotish_api_server.py` 行数 | `Path.read_bytes().count(b"\n")` | **11291** | 粗护栏 ≤ 11291 + 300 = 11591 |
+| 4a | 四空格 `def`（任务书同一种数法） | `^    (?:async )?def \w+` 扫全文件 | **225** | 主门，不得增长 |
+| 4b | `JyotishAPIHandler.__new__` | `scripts/` + `tests/` 的 `*.py`，排除合同测试自身 | **33** | 主门，不得增长 |
+
+说明：
+
+- 任务书表格写 api 行数 11,334；本机 `51a65d92` 实测 **11291**（未抄）。
+- 任务书表格写 `__new__` = 4：那是 **scripts/ 生产伪造点**（`consultation_workflow_service.py` ×2、`capture_report_blocked_repairs_golden.py` ×1、`local_accuracy_report.py` ×1）。任务书要求扫 `scripts/` 与 `tests/`，实测合计 **33**（scripts 4 + tests 29）。主门按扫描范围合计冻结，只许降不许升。失败信息会列出命中文件。
+- 全文件四空格 `def` = 225，其中 `JyotishAPIHandler` 类体 222、类前嵌套 3。冻结用任务书指定的全文件数法。
+- 只按 `useState(` 会计到 26，漏掉泛型调用；合同用 `\buseState[<(]`。
+
+`frontend/AGENTS.md` 只有 Next.js 版本提示，没有 §6 重复表述，本单未改。
+
+## 做了什么
+
+1. `tests/test_api_server_growth_contract.py`：主门改成类方法数 + `__new__` 计数；行数 rebaseline 为 11291 + 300。`must not grow` / `thinly registered` / `CORE_PYTEST_TARGETS` 三条原样仍绿。
+2. 新建 `frontend/tests/home-shell-growth-contract.test.ts`：`Home()` `useState` / `useRef` 不得增长，行数粗护栏 1951 + 150。
+3. `frontend/tests/chart-view-route.test.ts`：删除行数断言，保留 `doesNotMatch(pageSource, /chart-page|ChartPageView|\/api\/chart-view/)`，注明搬到 home-shell 合同。
+4. `AGENTS.md` §6：主门改耦合指标；删掉「参数式 hook 内部保持 0 个 React hook」；第三条三个「不得再手写第二套」原样保留；仍含 `must not grow` 与 `thinly registered`。
+
+## 既有断言改动
+
+| 文件 | 原值 | 新值 | 原因 |
+| --- | --- | --- | --- |
+| `chart-view-route.test.ts` `page.tsx does not grow to host the chart page` | `(pageSource.match(/\n/g) ?? []).length <= 1951` 且 `doesNotMatch(...)` | 测试改名为 `page.tsx does not host the chart page`，只留 `doesNotMatch` | 行数冻结与星盘页无关，搬到专用合同 |
+| `test_api_server_growth_contract.py` 行数 baseline | 11063（2026-09-02）+ 300 | **11291**（2026-09-16 实测）+ 300 | 任务书要求开工实测 rebaseline，不得抄旧数 |
+
+## 反向验证
+
+### 1. `page.tsx` 人为加一个 `useState`
+
+在 `Home()` 里插入 `const [_growthContractProbe, _setGrowthContractProbe] = useState(false);`，然后：
+
+```
+npx tsx --test tests/home-shell-growth-contract.test.ts
+not ok 1 - Home() useState count must not grow
+error: 'Home() has 67 useState calls; cap is 66. ...'
+# tests 3 / pass 2 / fail 1
+```
+
+`useRef` 与行数粗护栏仍绿。随后 `git checkout -- frontend/src/app/page.tsx`，文件回到 `51a65d92`。
+
+### 2. `jyotish_api_server.py` 人为加一个类方法
+
+在 `JyotishAPIHandler` 里插入 `def _growth_contract_probe(self): return None`，然后：
+
+```
+pytest tests/test_api_server_growth_contract.py
+FAILED test_jyotish_api_handler_method_count_must_not_grow
+AssertionError: ... has 226 four-space def methods; cap is 225.
+1 failed, 4 passed
+```
+
+行数粗护栏、`__new__`、AGENTS 措辞、`CORE_PYTEST_TARGETS` 仍绿——尺子动的是耦合门。随后 `git checkout -- scripts/jyotish_api_server.py`。
+
+## 测试
+
+本 worktree 的 `.venv` 是已跟踪的指针文件（内容 `/workspace/Jyotisha/.venv`），Windows 上不能当目录用，未覆盖。合同测试用本机 `C:\Users\74082\anaconda3\python.exe`（pytest 9.1.1）。
+
+| 命令 | 结果 |
+| --- | --- |
+| `python -m pytest tests/test_api_server_growth_contract.py -v` | **5 passed**（含原 `must not grow` / `thinly registered` / `CORE_PYTEST_TARGETS` 三条） |
+| `npx tsx --test tests/home-shell-growth-contract.test.ts tests/chart-view-route.test.ts` | **16 pass / 0 fail**（home-shell 3 + chart-view 13；chart-view 无行数断言） |
+| `./node_modules/.bin/tsc --noEmit` | 0 错 |
+| `npm run lint` | **0 error** / 119 warning（既有，未动） |
+| `npx tsx --test tests/*.test.ts` | 3196 tests / 3112 pass / **69 fail** / 15 skip。本单 3 条 + `page.tsx does not host the chart page` 均 `ok`。失败为无 Docker、Windows `SKILL.md` symlink `EPERM`、bash 部署脚本，与近期同机清单同类 |
+| `run_quality_gate.py --profile quick --skip-frontend-runtime` | **blocked**：`interpretation_source_inventory_gate.py` → `ModuleNotFoundError: No module named 'mcp'`。停在 pytest 之前，不是本单合同红。未写成通过 |
+
+同 SHA 近期进度 `PROGRESS-consultation-session-capacity-20260915.md` 记 `tests/*.test.ts` 为 3089 / 3001 / **73** fail。本机这次 3196 / 3112 / **69** fail（PowerShell glob 与计数差一截，fail 未增加）。本单新增 3 条全绿，不把 69 写成通过。
+
+未跑 `next build`：无 UI 改动；质量门在 Python 预检就停了。
+
+## 未做（属范围外）
+
+- 真的搬 `Home()` 状态或拆 `JyotishAPIHandler`（后续两单）
+- `__new__` 收到 0
+- 推 `origin HEAD:staging`
diff --git a/frontend/tests/chart-view-route.test.ts b/frontend/tests/chart-view-route.test.ts
index 3533885e..9768dfb6 100644
--- a/frontend/tests/chart-view-route.test.ts
+++ b/frontend/tests/chart-view-route.test.ts
@@ -296,8 +296,9 @@ test("the golden chart-view envelope stays inside the page contract", () => {
   assert.match(COORDINATE_BOUNDARY.qizheng, /角宿/);
 });
 
-test("page.tsx does not grow to host the chart page", () => {
-  assert.ok((pageSource.match(/\n/g) ?? []).length <= 1951);
+test("page.tsx does not host the chart page", () => {
+  // Line-count freeze moved to tests/home-shell-growth-contract.test.ts
+  // (Home() useState / useRef caps + coarse line-count guardrail).
   assert.doesNotMatch(pageSource, /chart-page|ChartPageView|\/api\/chart-view/);
 });
 
diff --git a/frontend/tests/home-shell-growth-contract.test.ts b/frontend/tests/home-shell-growth-contract.test.ts
new file mode 100644
index 00000000..c706d909
--- /dev/null
+++ b/frontend/tests/home-shell-growth-contract.test.ts
@@ -0,0 +1,53 @@
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import test from "node:test";
+
+const pageSource = readFileSync(new URL("../src/app/page.tsx", import.meta.url), "utf8");
+
+// Measured 2026-09-16 on origin/staging @ 51a65d92.
+// Line count: (pageSource.match(/\n/g) ?? []).length, same as `wc -l` = 1951.
+// Hook counts use \buseState[<(] / \buseRef[<(] so `useState<Type>(` is not missed.
+// Former line-count assertion lived in tests/chart-view-route.test.ts
+// (`page.tsx does not grow to host the chart page`).
+const PAGE_LINE_COUNT_BASELINE = 1951;
+const PAGE_LINE_COUNT_CAP = PAGE_LINE_COUNT_BASELINE + 150;
+const HOME_USE_STATE_CAP = 66;
+const HOME_USE_REF_CAP = 41;
+
+const USE_STATE_RE = /\buseState[<(]/g;
+const USE_REF_RE = /\buseRef[<(]/g;
+
+function homeSource(source: string): string {
+  const marker = "export default function Home(";
+  const start = source.indexOf(marker);
+  assert.notEqual(start, -1, "page.tsx must export default function Home(");
+  return source.slice(start);
+}
+
+function countMatches(source: string, pattern: RegExp): number {
+  return source.match(new RegExp(pattern.source, "g"))?.length ?? 0;
+}
+
+test("Home() useState count must not grow", () => {
+  const n = countMatches(homeSource(pageSource), USE_STATE_RE);
+  assert.ok(
+    n <= HOME_USE_STATE_CAP,
+    `Home() has ${n} useState calls; cap is ${HOME_USE_STATE_CAP}. Extracted hooks and child components should own their own state.`,
+  );
+});
+
+test("Home() useRef count must not grow", () => {
+  const n = countMatches(homeSource(pageSource), USE_REF_RE);
+  assert.ok(
+    n <= HOME_USE_REF_CAP,
+    `Home() has ${n} useRef calls; cap is ${HOME_USE_REF_CAP}. Do not rewrite state as refs to dodge the useState freeze.`,
+  );
+});
+
+test("page.tsx line count stays within the coarse guardrail", () => {
+  const n = (pageSource.match(/\n/g) ?? []).length;
+  assert.ok(
+    n <= PAGE_LINE_COUNT_CAP,
+    `page.tsx has ${n} lines; cap is ${PAGE_LINE_COUNT_CAP} (${PAGE_LINE_COUNT_BASELINE} baseline + 150).`,
+  );
+});
diff --git a/tests/test_api_server_growth_contract.py b/tests/test_api_server_growth_contract.py
index d6c977d4..18bba5de 100644
--- a/tests/test_api_server_growth_contract.py
+++ b/tests/test_api_server_growth_contract.py
@@ -1,30 +1,81 @@
-"""Freeze scripts/jyotish_api_server.py growth.
+"""Freeze coupling in scripts/jyotish_api_server.py.
 
 New endpoints and features must live in new modules and be thinly registered
-from the main file. This cap is the live line count at freeze (11063 on
-2026-09-02, via `wc -l`) plus 300 lines of bugfix slack.
+from the main file. Line count is only a coarse guardrail; the live gates are
+JyotishAPIHandler method count and JyotishAPIHandler.__new__ forgery sites.
 """
 
 from __future__ import annotations
 
+import re
+from collections import Counter
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
 API_SERVER = ROOT / "scripts" / "jyotish_api_server.py"
 AGENTS = ROOT / "AGENTS.md"
 
-# Live `wc -l scripts/jyotish_api_server.py` at freeze. New features must not
-# consume this budget; open a module instead.
-JYOTISH_API_SERVER_LINE_COUNT_BASELINE = 11063
+# Live `wc -l scripts/jyotish_api_server.py` equivalent:
+# Path.read_bytes().count(b"\n"), measured 2026-09-16 on origin/staging @ 51a65d92.
+# New features must not consume this budget; open a module instead.
+JYOTISH_API_SERVER_LINE_COUNT_BASELINE = 11291
 JYOTISH_API_SERVER_LINE_COUNT_CAP = JYOTISH_API_SERVER_LINE_COUNT_BASELINE + 300
 
+# Whole-file indent match `^    (?:async )?def \w+`, same count as
+# TASK-freeze-metric-change-20260915 §1. Measured 2026-09-16 @ 51a65d92.
+JYOTISH_API_HANDLER_METHOD_COUNT_BASELINE = 225
+
+# `JyotishAPIHandler.__new__` in scripts/ and tests/ `*.py`, excluding this file.
+# Measured 2026-09-16 @ 51a65d92: scripts/ production forgeries = 4, tests/ = 29.
+JYOTISH_API_HANDLER_NEW_COUNT_BASELINE = 33
+
+HANDLER_METHOD_RE = re.compile(r"^    (?:async )?def \w+", re.MULTILINE)
+NEW_MARKER = "JyotishAPIHandler.__new__"
+
+
+def _handler_method_count(source: str) -> int:
+    return len(HANDLER_METHOD_RE.findall(source))
+
+
+def _new_hits() -> Counter[str]:
+    hits: Counter[str] = Counter()
+    skip = Path(__file__).resolve()
+    for folder in (ROOT / "scripts", ROOT / "tests"):
+        for path in sorted(folder.rglob("*.py")):
+            if path.resolve() == skip:
+                continue
+            count = path.read_text(encoding="utf-8").count(NEW_MARKER)
+            if count:
+                hits[path.relative_to(ROOT).as_posix()] = count
+    return hits
+
+
+def test_jyotish_api_handler_method_count_must_not_grow() -> None:
+    source = API_SERVER.read_text(encoding="utf-8")
+    count = _handler_method_count(source)
+    assert count <= JYOTISH_API_HANDLER_METHOD_COUNT_BASELINE, (
+        f"{API_SERVER.as_posix()} has {count} four-space def methods; "
+        f"cap is {JYOTISH_API_HANDLER_METHOD_COUNT_BASELINE}. Move behaviour "
+        "into a dedicated module; thinly registered from this file."
+    )
+
+
+def test_jyotish_api_handler_new_count_must_not_grow() -> None:
+    hits = _new_hits()
+    total = sum(hits.values())
+    listed = ", ".join(f"{path}:{count}" for path, count in sorted(hits.items()))
+    assert total <= JYOTISH_API_HANDLER_NEW_COUNT_BASELINE, (
+        f"{NEW_MARKER} appears {total} times under scripts/ and tests/; "
+        f"cap is {JYOTISH_API_HANDLER_NEW_COUNT_BASELINE}. Hits: {listed}"
+    )
+
 
 def test_jyotish_api_server_must_not_grow_beyond_bugfix_slack() -> None:
     line_count = API_SERVER.read_bytes().count(b"\n")
     assert line_count <= JYOTISH_API_SERVER_LINE_COUNT_CAP, (
         f"{API_SERVER.as_posix()} has {line_count} lines; cap is "
         f"{JYOTISH_API_SERVER_LINE_COUNT_CAP} ({JYOTISH_API_SERVER_LINE_COUNT_BASELINE} "
-        "baseline + 300 bugfix slack). New endpoints and features must be new "
+        "baseline + 300 coarse guardrail). New endpoints and features must be new "
         "modules, thinly registered from this file."
     )