feat(western): fix Koch house trisection and add Swiss house goldens

docs/STATUS.md

@@ -179,7 +179,7 @@ never by hand.
 | Command                        | Result                                                                                                                                                                                                                                                                                                                                    |
 | ------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `pnpm run typecheck`           | clean (tsc strict over packages, tools, tests)                                                                                                                                                                                                                                                                                            |
-| `pnpm run test`                | 556 tests / 31 files �all passing (all systems + JPL Horizons 独立 golden + interpret + 吉凶 + 合婚 + reading-lint/空话/重复/越界 + validate-answer v2 结构与措辞门禁（约束引用事实豁免+全可见文本安全扫�资源上限+有界解析入口，非语义正确性证明） + western-rules/ziwei-rules 语义规则 + 版本迁移/回滚/目标白名�+ PII 隐私护栏 green) |
+| `pnpm run test`                | 675 tests / 33 files �all passing (all systems + JPL Horizons 独立 golden + interpret + 吉凶 + 合婚 + reading-lint/空话/重复/越界 + validate-answer v2 结构与措辞门禁（约束引用事实豁免+全可见文本安全扫�资源上限+有界解析入口，非语义正确性证明） + western-rules/ziwei-rules 语义规则 + 版本迁移/回滚/目标白名�+ PII 隐私护栏 green) |
 | `pnpm run build`               | `engine.mjs` ï¿?2.8 MB + `sbom.cdx.json` + `sbom.spdx.json` (6 runtime deps)                                                                                                                                                                                                                                                               |
 | `pnpm run validate:skill`      | 40 / 40 (incl. scripts/ no-stray-files guard + CycloneDX/SPDX SBOM checks + validate-answer/lint-reading gate-workflow doc checks)                                                                                                                                                                                                        |
 | `pnpm run validate:reading`    | 53 / 53 (topic example libraries + output-spec structure + 无术语区 firewall; offline, no LLM)                                                                                                                                                                                                                                            |
@@ -216,9 +216,10 @@ runnable from a clean copy outside the repo, offline, deterministic.
 ## Open risks
 
 - Western angles/houses are derived in-house (not astronomy-engine); they are validated against
-  the MC=RAMC and eastern-horizon oracles, but an independent golden house-table (e.g. a Swiss
-  Ephemeris reference chart) would further harden them. (Planetary longitudes now HAVE an
-  independent JPL Horizons golden; only the house layer still lacks one.)
+  the MC=RAMC and eastern-horizon oracles and an independent Swiss Ephemeris house golden
+  (swetest 2.10.03, 5 synthetic cases x 5 systems, 12 cusps + angles each, worst measured
+  deviation 0.69 arc-minutes; see packages/western/goldens/README.md). The golden covers
+  normal latitudes; circumpolar instants are contract-tested (HOUSE_SYSTEM_UNAVAILABLE).
 - LMT-era (early 1901+) offsets are whole-minute precision (moment-timezone limitation).
 - Equation of time is an approximation (~tenths of a minute); fine for display, not high-precision.
 - TypeScript pinned to 5.9 while registry `latest` is 7.0; revisit after TS 7 soaks.

docs/VALIDATION.md

@@ -59,7 +59,7 @@ the identical table in [STATUS.md](./STATUS.md) ("Commands & results"). Do not h
 resolve a disagreement; re-run the suite and copy the actual count. `pnpm run check:doc-counts`
 re-runs the suite and fails if either doc's `N tests / M files` count drifts from the real run.
 
-- Typecheck: clean. Tests: **556 tests / 31 files ï¿?all passing**. The Western provider
+- Typecheck: clean. Tests: **675 tests / 33 files ï¿?all passing**. The Western provider
   (astronomy-engine, VSOP87 + NOVAS) passes the ADR-0003 ï¿?ï¿?gate two ways: wrapper-consistency
   (vs astronomy-engine's own output) plus an **independent JPL Horizons golden** (10 bodies × 3
   technical epochs fetched from the NASA/JPL Horizons service, query recorded in
@@ -133,11 +133,11 @@ canonical-JSON order independence; deterministic hashing; calculate determinism.
   why it is trustworthy.
 - Western: at least one set cross-checked against JPL/Swiss; main-body positions within ï¿?
   arc-minute; discrete classifications (sign/house changes) must match exactly. (Planetary
-  longitudes: met via the JPL Horizons golden; an independent house table is still open.)
+  longitudes: met via the JPL Horizons golden; house cusps: met via the Swiss Ephemeris house golden.)
 - BaZi/Zi Wei: sourced references, NOT another wrapper of the same core library.
 - Snapshots guard against regressions only; they never become ground truth.
-- Minimum targets: time/location 30 (met: 36), Western 20 (met: 30 ï¿?JPL Horizons golden
-  longitudes), BaZi 40, Zi Wei 20.
+- Minimum targets: time/location 30 (met: 36), Western 20 (met: 55 ï¿?JPL Horizons golden
+  longitudes + 25 Swiss Ephemeris house-cusp sets), BaZi 40, Zi Wei 20.
 
 ## Must-test boundaries (tracked to Phase 2)
 

packages/western/goldens/README.md

@@ -1,4 +1,4 @@
-# Western independent golden fixtures (JPL Horizons)
+# Western independent golden fixtures (JPL Horizons + Swiss Ephemeris)
 
 This directory holds the **independent** ephemeris cross-check of the Western provider
 against authoritative [JPL Horizons](https://ssd.jpl.nasa.gov/horizons/) geocentric
@@ -21,9 +21,91 @@ that layer, plus the Sun cardinal-point anchors).
 Do **not** fabricate values here. When adding rows or epochs, copy them from a real,
 reproducible JPL Horizons query and record the exact query in the fixture's `source` block.
 
+## Swiss Ephemeris house golden — POPULATED
+
+`swiss-ephemeris-houses.json` is the independent house-cusp golden (placidus / koch /
+porphyry / equal / whole-sign) referenced against the Swiss Ephemeris `swetest`
+command-line tool. **Populated** (swetest `Version: 2.10.03`, captured 2026-07-28,
+input time scale UTC via `-utc`): 5 synthetic technical epochs × 5 systems × 12 cusps
+plus ASC/MC/ARMC, transcribed deterministically from a reviewed local capture whose
+per-file SHA-256 (stdout, stderr and argv of all 25 calls + version banner) is recorded
+in the fixture's `source.rawSha256`. Measured worst deviation at population time:
+placidus 0.286′, koch 0.688′, porphyry/equal/whole-sign 0.187′ — per-system
+`toleranceArcmin` is the measured maximum plus headroom (0.5′ / 0.9′ / 0.35′), all under
+the ≤1′ gate (rationale recorded in `toleranceRationale`; the residual is dominated by
+mean-vs-true obliquity). `western-house-golden.test.ts` keeps its fail-closed capture
+gate: a de-populated or half-filled fixture turns the suite red again.
+
+Do **not** edit golden values by hand; regenerate via `tools/generate-house-golden.ts`
+and re-review.
+
+### Source & licensing boundary
+
+- `swetest` is used **only** as a one-off external reference generator. Its numeric output
+  (factual astronomical data for given inputs) is recorded here; the swetest program,
+  sources, binaries and ephemeris data files never enter this repository, the lockfile,
+  the SBOM, the release bundle or CI. Tests run fully offline from the tracked fixture.
+- The reference commands use `-emos` (Moshier). This round's reference commands do not
+  require bringing external ephemeris data files into the repository; no additional
+  precision claim is made here — measured tolerances are recorded in the fixture only
+  after a real capture.
+
+### Capture workflow (two-phase)
+
+1. On a machine with a local `swetest` install, run:
+
+   PowerShell:
+
+   ```
+   $env:SWETEST_PATH = 'C:\path\to\swetest.exe'; node --experimental-strip-types tools/generate-house-golden.ts
+   ```
+
+   POSIX:
+
+   ```
+   SWETEST_PATH=/path/to/swetest node --experimental-strip-types tools/generate-house-golden.ts
+   ```
+
+   The script refuses to run without `SWETEST_PATH` (it never downloads anything) and
+   invokes `swetest -b<DD.MM.YYYY> -utc<HH:MM:SS> -house<lonE>,<lat>,<LETTER> -emos -head`
+   once per sample × system (letters: P=placidus, K=koch, O=porphyry, E=equal(Asc),
+   W=whole-sign), for 5 synthetic technical epochs (see the sample matrix in the script;
+   none of them is real birth data).
+
+2. All output is first written to an untracked staging directory
+   (`.tmp/house-golden-raw.staging-<utc>/`) and atomically renamed to
+   `.tmp/house-golden-raw/` only after every invocation succeeds and parses; a
+   pre-existing capture directory is renamed aside (never deleted, never merged), so
+   stale raw files cannot mix into a fresh capture. Contents:
+   `case-<id>-<system>.stdout.txt` / `.stderr.txt` per invocation,
+   `version.stdout.txt` / `version.stderr.txt`, `manifest.json` (full argv per call,
+   swetest version line, UTC capture time, separate SHA-256 for every stdout/stderr/argv,
+   sample matrix) and `draft-fixture.json` (parsed draft). The script exits non-zero —
+   producing no final directory — on any spawn error, signal, non-zero exit,
+   error-looking stderr, parse failure, missing field, or a quadrant-system output
+   mentioning "Porphyry" on either stream (swetest's silent high-latitude fallback,
+   which this project **rejects**).
+3. The capture is then reviewed (manifest ↔ raw SHA-256 cross-check, draft ↔ raw
+   cross-check, order-of-magnitude sanity against engine output) before being transcribed
+   into the tracked fixture with `status: "populated"`, real `source.version` /
+   `captureDateUtc` / `rawSha256`, and per-system `toleranceArcmin` set to the smallest
+   justified value ≤ 1 arc-minute (rationale recorded in `toleranceRationale`).
+
+### High-latitude boundary
+
+The high-latitude tests in `western-house-golden.test.ts` are fixture-independent engine
+self-assertions. The contract for the quadrant systems (Placidus, Koch) is: whenever the
+geometry is undefined they must throw `HOUSE_SYSTEM_UNAVAILABLE` — never silently fall
+back (swetest falls back to Porphyry there; this project rejects that fallback). Koch's
+guard is the MC degree's own semi-arc (undefined when the MC degree is circumpolar,
+|tan φ · tan δ_MC| > 1); the suite asserts it on synthetic instants VERIFIED against the
+implementation to hit that condition. Whether koch is defined at a given high-latitude
+instant depends on λ_MC at that moment — no blanket "always fails" claim is made.
+
 ## Not covered (still open)
 
-- An independent golden **house table** (e.g. a Swiss Ephemeris reference chart) for the
-  in-house angles/houses — tracked in `docs/STATUS.md` Open risks.
+- The house golden covers normal latitudes only (five synthetic cases between 33.9°S and
+  59.9°N); circumpolar instants are covered by contract tests (throw, no fallback), not
+  by golden values.
 - The sidereal zodiac, true node and asteroids remain `precision: approximate` with their
   own continuity regression; they are intentionally outside this ≤1′ golden.