ICE extraction overhaul: API discovery + aging report + historical backfill

- Replace brittle ICE_STOCKS_URL env var with API-based URL discovery via
  the private ICE Report Center JSON API (no auth required)
- Add rolling CSV → XLS fallback in extract_ice_stocks() using
  find_latest_report() from ice_api.py
- Add ice_api.py: fetch_report_listings(), find_latest_report() with
  pagination up to MAX_API_PAGES
- Add xls_parse.py: detect_file_format() (magic bytes), xls_to_rows()
  using xlrd for OLE2/BIFF XLS files
- Add extract_ice_aging(): monthly certified stock aging report by
  age bucket × port → ice_aging/ landing dir
- Add extract_ice_historical(): 30-year EOM by-port stocks from static
  ICE URL → ice_stocks_by_port/ landing dir
- Add xlrd>=2.0.1 (parse XLS), xlwt>=1.3.0 (dev, test fixtures)
- Add SQLMesh raw + foundation models for both new datasets
- Add ice_aging_glob(), ice_stocks_by_port_glob() macros
- Add extract_ice_aging + extract_ice_historical pipeline entries
- Add 12 unit tests (format detection, XLS roundtrip, API mock, CSV output)

Seed files (data/landing/ice_aging/seed/ and ice_stocks_by_port/seed/)
must be created locally — data/ is gitignored.

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

uv.lock

@@ -1060,10 +1060,14 @@ version = "0.1.0"
 source = { editable = "extract/ice_stocks" }
 dependencies = [
     { name = "niquests" },
+    { name = "xlrd" },
 ]
 
 [package.metadata]
-requires-dist = [{ name = "niquests", specifier = ">=3.14.1" }]
+requires-dist = [
+    { name = "niquests", specifier = ">=3.14.1" },
+    { name = "xlrd", specifier = ">=2.0.1" },
+]
 
 [[package]]
 name = "identify"
@@ -1558,6 +1562,7 @@ dev = [
     { name = "pytest-cov" },
     { name = "pyyaml" },
     { name = "ruff" },
+    { name = "xlwt" },
 ]
 exploration = [
     { name = "ipykernel" },
@@ -1584,6 +1589,7 @@ dev = [
     { name = "pytest-cov", specifier = ">=7.0.0" },
     { name = "pyyaml", specifier = ">=6.0.2" },
     { name = "ruff", specifier = ">=0.9.9" },
+    { name = "xlwt", specifier = ">=1.3.0" },
 ]
 exploration = [{ name = "ipykernel", specifier = ">=6.29.5" }]
 
@@ -3591,6 +3597,24 @@ wheels = [
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 ]
 
+[[package]]
+name = "xlrd"
+version = "2.0.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/07/5a/377161c2d3538d1990d7af382c79f3b2372e880b65de21b01b1a2b78691e/xlrd-2.0.2.tar.gz", hash = "sha256:08b5e25de58f21ce71dc7db3b3b8106c1fa776f3024c54e45b45b374e89234c9", size = 100167, upload-time = "2025-06-14T08:46:39.039Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/1a/62/c8d562e7766786ba6587d09c5a8ba9f718ed3fa8af7f4553e8f91c36f302/xlrd-2.0.2-py2.py3-none-any.whl", hash = "sha256:ea762c3d29f4cca48d82df517b6d89fbce4db3107f9d78713e48cd321d5c9aa9", size = 96555, upload-time = "2025-06-14T08:46:37.766Z" },
+]
+
+[[package]]
+name = "xlwt"
+version = "1.3.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/06/97/56a6f56ce44578a69343449aa5a0d98eefe04085d69da539f3034e2cd5c1/xlwt-1.3.0.tar.gz", hash = "sha256:c59912717a9b28f1a3c2a98fd60741014b06b043936dcecbc113eaaada156c88", size = 153929, upload-time = "2017-08-22T06:47:16.498Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/44/48/def306413b25c3d01753603b1a222a011b8621aed27cd7f89cbc27e6b0f4/xlwt-1.3.0-py2.py3-none-any.whl", hash = "sha256:a082260524678ba48a297d922cc385f58278b8aa68741596a87de01a9c628b2e", size = 99981, upload-time = "2017-08-22T06:47:15.281Z" },
+]
+
 [[package]]
 name = "yfinance"
 version = "1.2.0"