RdSAP 10 item 2-3(h) "another dwelling above" is U=0 (spec p.45: "There is no
heat loss through the roof of a building part that has the same dwelling above
or another dwelling above"). gov-API `roof_construction = 3` is that code, but
the mapper labelled it "Pitched (slates/tiles), no access to loft" (which is
code 5), so the per-part party override at heat_transmission.py:1172 never
matched and the part fell through to the dwelling_type-label-only
has_exposed_roof heuristic.
190 of the 200 corpus code-3 parts sit at index 0 and are already suppressed by
`_cert_lodges_exposed_roof` off the roof_insulation_location == "ND" signal. The
unmitigated set is the 10 parts at index > 0, where extensions default to
exposed and were billed a phantom pitched roof. Also removes a latent PV defect:
the bogus "Pitched" prefix satisfied `is_pitched` and divided PV array area by
cos(35 deg), inflating kWp.
Shipped with the stairwell fix so the corpus pin moves once: within-0.5
78.8% -> 79.6%, SAP MAE 0.626 -> 0.611, PE MAE 2.9 -> 2.7.
The roof change alone trades 4 certs out of the +-0.5 band for 2 in (one moving
4.4 SAP closer). Those 4 were investigated and are NOT a masked bug: the corpus
error distribution is symmetric (mean +0.076, median +0.03, sigma 1.606; 112
certs above +0.5 vs 102 below), ground-floor flats show 7 positive / 8 negative
with no excess over the null, and closing them needs HLC changes of 2.3-5.6% —
below the ~8.8% noise floor of the RHI anchor, calibrated on the 76 certs whose
SAP is exact (space-heating ratio 1.062 +/- 0.088).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
All six are `from_site_notes`-only (gov-API RdSAP corpus unmoved at 78.9%),
graded against the DB PasHub-assessment oracle (energy_rating_current,
source='lodged'), not the surveyor-entered pre_sap.
A. Manual-Entry boiler efficiency. Extractor read PCDF-Search columns that a
manual survey lacks; mapper returned None for all boilers → the generic
0.80 gas default. Now read `Type of boiler:` / `Heating System (Boiler):`
/ `Is there an open flue?` and resolve the descriptor to its SAP 10.2
Table 4b code. Moves all 7 Wythenshawe manual boilers to the oracle
(4a Hollyhedge back boiler 63.6→53.4=53; group MAE 2.42→0.42).
B. Room-in-roof gable type None → strict-raise. A form variant omits the
gable-type line (genuine field-absence); default None → party `gable_wall`
(U=0.25), mirroring `_api_type_1_gable_kind(None)`. Present-but-unknown
labels still strict-raise. Unblocks 8 & 34 Bucklow Drive.
C. Secondary `Closed room heater` unmapped → add Table 4a code 633.
Unblocks 8 Brinkshaw Avenue.
D. Alternative-wall insulation thickness never extracted → parse
`Wall insulation thickness:` and pass it through instead of the RdSAP 10
§5.4 100 mm favourable default.
E. `Number of heated rooms?` label mismatch → the PDF lodges
`Please enter the number of HEATED rooms:`.
F. HW cylinder thermostat dropped (NEW, systematic). `_map_sap_heating`
never set `cylinder_thermostat`, so a surveyed thermostat defaulted None
and the calculator applied the SAP 10.2 Table 2b Note a) ×1.3 penalty.
Map it ("Y"/"N", gated on a lodged cylinder) as the Elmhurst path does.
Fixes the two worst DB-oracle under-raters (52 Bucklow 59.4→61.8=62;
13 Kerne Grove 65.0→67.1=67).
DB-oracle cohort (148 matched): within-0.5 83.8%→87.8%, MAE 0.427→0.303.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
A mid-terrace / enclosed-mid-terrace (built_form 4/6) has external walls on
its two opposite (front/rear) faces only (RdSAP 10 §1.1, p.7-8); both end/
gable elevations — and their room-in-roof continuations — abut a neighbour
and are party walls (§1.4.3, p.9). The gov-API path is built_form-blind, so a
cert lodging an "Exposed" RR gable (`gable_wall_type=1`) on such a form had it
billed at the masonry main-wall U (~2.5) instead of the party 0.25 (Table 4,
p.22), over-counting fabric heat loss and under-rating the dwelling.
`_api_type_1_gable_kind` now takes `built_form` and reclassifies an Exposed RR
gable to Party on the both-ends-party forms {4, 6} only; end-terrace {3, 5},
semi {2} and detached {1} keep their genuine exposed gable. The API path lodges
no per-gable U, so this only ever overrides a cascade fallback.
Corroborated three ways: RdSAP §1.1 + Table 4; S10TP-05 Appendix A (a
mid-terrace's roof-gable junction length is zero); and three accredited
Elmhurst mid-terrace worksheets (000477/000480/000516), which all lodge Party
gables. Those worksheets run the site-notes path (already correct) so the 195
Elmhurst pins are untouched.
Corpus (RdSAP-21.0.1, 1000 certs): within-0.5 78.8% -> 79.5%, SAP MAE
0.625 -> 0.599, PE MAE 2.85 -> 2.71, CO2 MAE 0.070 -> 0.068. Cert
100040550095 -10.13 -> +0.37; the 18-cert terraced-external-gable cohort mean
-1.94 -> +0.11; end-terrace/semi/detached untouched. Thresholds ratcheted.
Tests: new test_mapper_rir_gable_terraced (9); 195 Elmhurst pins, 288
cert_to_inputs/real-cert pins, 54 mapper tests, and the corpus gauge all green;
no new pyright errors.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
#1631: the label blocks in the main room-heater type table (Heating
System (Other) field), not the secondary table the issue cited — same
PCDB row either way. Wythenshawe 164→165 computed. The fixture scores
49.5 vs pre_sap 31: its own 2025 accredited cert
6890-0597-0722-0196-3943 lodges the identical codes (603/26/2601) at
band E agreeing with us, while pre_sap matches the dwelling's
superseded electric configuration (2017/2023 certs, band F) — accepted
divergence, MAE ceiling re-baselined 0.75→0.85 with the citation.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
#1628: fixture 500796700868 re-blocks on a later label
(first-exception-hit); metrics unchanged, ratchets hold.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Follow-on surfaced by #1626: fixture 500796646644 progressed past the
2404 conflict onto cylinder insulation 'Loose jacket' → code 2 (gov-API
coding, Elmhurst 'Jacket' sibling). Wythenshawe 161→162 computed
(32.6 vs pre 34); ratchets hold at 75.3%/0.744.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
#1626: ground truth resolved per the issue's option 3. The accredited
cert 0764-2894-7173-2720-5535 (62 Mayfair Road, UPRN 77066640 — the
blocked Wythenshawe fixture's dwelling) lodges 402 + 2402 for the same
heater description, and RdSAP 10 p.80 (item 7-3) requires a PCDB index
for any HHR lodgement — absent one, the surveyed type field is
authoritative and 2404 downgrades to 2402 (automatic charge control,
preserving the tick's automatic-charging semantics). Applies only to
the mapped non-HHR types (402/404); any other pairing still fails loud.
LRHA fixture 505091686590 (Fan storage heater, same slip) computes
64.0 vs pre 65; LRHA 76→77 computed.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
#1625: 'Same dwelling below' → the "(another dwelling below)" party-
floor suppression string, mirroring the gov-API code-8 precedent
(RdSAP 10 §3: an internal floor between heated storeys has no floor
heat loss). Wythenshawe 151→161 computed; 7/10 newly-unblocked land
within 0.5 — ratchets re-baselined 0.76/0.72 → 0.75/0.75 for the two
tail entries (−3.3/−5.5).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
#1624: Wythenshawe 149→151 computed. 500767954156 lands within 0.5;
500797465814 is a −8.8 tail entry — MAE ceiling re-baselined 0.67→0.72
per the coverage-growth convention (within-0.5 floor 0.76 holds).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
#1637: 'MV - Heat Recovery' → MVHR kind (Table 4g default 46.2% heat
recovery — PasHub lodges no PCDF product/wet-rooms/duct data, so these
land in the accuracy tail as the issue predicts). Unblocking them
surfaced 4 biomass heat networks whose fuel label 'Heat from boilers -
biomass' passed through raw to the calculator's MissingMainFuelType —
now mapped to Table 12 code 43, and any other uncovered community fuel
strict-raises UnmappedPasHubLabel at the boundary (ADR-0015).
LRHA 61→76 computed / 28 blocked / 0 errored, within-0.5 43.4%,
MAE 2.985 — ratchets hold.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
#1636: the 6 single-line-label fixtures unblock and re-block on later
labels (MVHR/cylinder); the 6 line-wrap-truncated '…room thermostat
and' fixtures still need the extractor fix tracked under #1622.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
#1635: 'Programmer, room thermostat and TRVs' on a heat pump → 2210
(PCDB heat_pump_controls), and the lodgement now carries Table 4a
category 4 — without it the calculator's Appendix N3.6/N3.7 gate never
fired and the PCDB heat pump was billed as 100%-efficient direct
electric (6.0/18.5 vs pre 62/57). With the category threaded the two
LRHA WAVE 3 fixtures score 52.1/56.9 (the latter within 0.5).
LRHA 59→61 computed, within-0.5 42.6%, MAE 2.830 — ratchets hold.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Positive input ventilation sourced from the loft is treated as natural
ventilation under SAP 10.2 §2 (24d) — matching the MechanicalVentilationKind
.NATURAL contract — so the label now resolves instead of raising
UnmappedElmhurstLabel and blocking the whole Elmhurst Summary. Surfaced on
8 WCHG Elmhurst certs (e.g. 29 Piper Hill Avenue, 38 Bucklow Drive).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Teaches the pashub `from_site_notes` mapper the electric-storage-heater and
room-heater families, following the existing boiler/heat-network split exactly
(fix at the mapper boundary, ADR-0015 — never mis-rate, never strict-raise deep
in the calculator). Adds:
- Table 4e Group 4 storage charge-control codes (2401/2402/2404) and Group 6
room-heater control codes (2602/2605), each gated on its own system group so a
control label never takes a wrong-group 2xxx code.
- The Table 4a system code from the surveyed heater type lodged in the "Heating
System (Other)" field (`community_heat_source`): Fan storage 404, slimline
402, PCDF-Search product ⇒ HHR 409 (RdSAP 10 p.80), room heaters 691/694.
- A 2404⇔409 coherence guard: high-heat-retention controls on a non-HHR storage
type is a surveyor contradiction and fails loud rather than rating a mismatch.
All codes taken from the SAP 10.2 spec (14-03-2025 PDF) and already present in
the calculator's inventories — no calculator change.
LRHA WAVE 3 (lincs rural) accuracy: 8 computed / 96 blocked → 45 computed / 59
blocked / 0 errored (within-0.5 46.7%, MAE 2.989); ratchets re-baselined to the
new coverage. Guinness cohort (208) + gov-API corpus unchanged; pyright --strict
adds zero new errors.
Closes#1619
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
`_PASHUB_FLOOR_EXPOSURE` mapped the surveyed "Semi Exposed (unheated)"
floor label to `is_above_partially_heated_space` (RdSAP §5.14, constant
U=0.7). A floor semi-exposed to an enclosed UNHEATED space belongs in
§5.13 Table 20 `u_exposed_floor` (band-B as-built U=1.20). §5.14's U=0.7
is reserved for a floor above a *partially* heated space. #1602
transposed the two branches; the too-low U under-counted floor loss on
the 9 label-carrying cohort fixtures → a shared over-credit.
Triangulated against all three siblings + the calculator docstring: the
gov-API code-2 "To unheated space" (mapper.py:4797) and Elmhurst
`_is_floor_exposed_to_unheated_space` (mapper.py:5970) both route to
Table 20; rdsap_uvalues.py:1416 documents Table 20 as collapsing exposed
and semi-exposed-to-unheated into one lookup. One-line data flip,
from_site_notes-only (gov-API RdSAP corpus untouched, still 78.9%).
Adjacent Ronald St mid-terrace pair (the clustered signal): 10 Ronald
60.35→59.02 (oracle 59), 12 Ronald 60.79→59.36 (oracle 59). Cohort vs
DB oracle (portfolio 838 effective_sap) 83.3%→86.9% within-0.5, MAE
0.377→0.348, no built form regresses, all 7 verified dwellings unchanged
(none carry the label). pashub harness 79.5%→82.4%, MAE 0.389→0.367;
ratchets tightened 0.78→0.82 / 0.40→0.37. pyright zero-new.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Electric-immersion DHW: bill at 100%, not the space boiler's efficiency 🟩
A separate electric immersion heater (SAP water-heating code 903) is 100%
efficient (SAP 10.2 Table 4a) and the space-heating boiler provides no water
heating, so Appendix D2.1 Eq D1 (the boiler seasonal-efficiency cascade) must
not apply to it. But `_water_heating_main` resolves DHW to the SPACE main — a
gas/oil boiler keeps its PCDB record — so three water-efficiency branches in
cert_to_inputs billed the immersion-heated cylinder at the boiler's ~87% summer
efficiency (a mongrel: electric fuel price x gas-boiler efficiency):
1. the scalar `water_eff = water_pcdb_main.summer_efficiency_pct / 100`,
2. the SAP §9.4.11 / Table 4c(2) -5pp no-interlock adjustment, and
3. the Eq D1 (winter, summer) seasonal pair from `pcdb_main`.
Gate all three on `not dhw_is_electric_immersion`; the correct immersion path
(`_water_efficiency_with_category_inherit` -> 1.0, Eq D1 off) then applies,
mirroring the Table 3 zero-primary-loss gate already present for WHC 903.
General bug — fires for any WHC-903 dwelling whose space main is a PCDB gas/oil
boiler. It surfaced via the PasHub campaign's #1600 no-water-heating default
(WHC 999 -> 903) on a gas-combi dwelling: 58 Hackle St M11 4WU, SAP 55.30 ->
57.67 (pre_sap 58, verified 59).
Guardrails: the gov-API RdSAP corpus IMPROVES 78.8% -> 78.9% within-0.5, MAE
0.625 -> 0.622 (a handful of corpus certs with a boiler space main + electric
immersion move closer to accredited) — MAE ceiling ratcheted 0.626 -> 0.625.
Regression pinned in test_cert_to_inputs (RED before / GREEN after). pyright
0-new (cert_to_inputs baseline 30).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* PasHub SAP accuracy: thread low-energy lights + draught lobby (from_site_notes) 🟩
Two systematic silent-drops in the PAS Hub `from_site_notes` path, each a field
the gov-API/Elmhurst mappers thread but site-notes dropped, letting a favourable
default reach the SAP-10.2 calculator. Validated against the correct pashub
oracle (property_baseline_performance.effective_sap_score, portfolio 838):
cohort within-0.5 55.1% → 62.6%, MAE 0.599 → 0.521.
- Low-energy lights: when "exact LED/CFL known = No", PAS Hub lodges an aggregate
"Number of fixed low energy lights?" count. Previously dropped (no dataclass
field / extractor key / mapper thread) → calculator saw 0 low-energy bulbs and
applied the pessimistic L5b/L8c no-data default, under-rating SAP. Now threaded
into low_energy_fixed_lighting_bulbs_count, mirroring from_elmhurst_site_notes.
~6% of the cohort; resolves 58 Hackle (−0.43 vs oracle 59 with #1615).
- Draught lobby: _map_sap_ventilation set only the legacy `draught_lobby` field,
never the canonical `has_draught_lobby` §2 (13) gate the cascade reads, so the
surveyed lobby was ignored and infiltration over-stated. Now mirrors Elmhurst.
Two other audited levers were REJECTED against the pashub oracle (they matched
the gov-cert/RdSAP convention but pashub does not apply them): percent_draughtproofed
(cohort 30.8%) and the §A.2.2 assumed secondary heater (19.2%). A heat-network
control-code fix (2306→2303 for 16 Bingley) is HELD pending spec/Elmhurst
adjudication — it contradicts ADR-0053; see the NOTE on _PASHUB_HEAT_NETWORK_CONTROL_TO_SAP10.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* PasHub heat-network control: room-thermostat-only maps to 2308, not 2306 🟩
The Table 4e Group 3 label "charging linked to use of community heating, room
thermostat only" was mapped to 2306 — the linked-to-use *with-TRVs* code
(control type 3, space charging 1.00). The label explicitly excludes TRVs, so
it is control type 2 / space 1.05 = code 2308/2309 (linked-to-use → DHW 1.00).
2306 asserted TRVs the survey doesn't have and over-rated the cohort's sole
heat-network dwelling (16 Bingley Close 56.89 → 54.01 vs pashub oracle 52).
Verified against SAP 10.2 Table 4e as encoded in cert_to_inputs.py
(_CONTROL_TYPE_BY_CODE 2308→2, space-charging 2308→1.05, DHW 2308→1.00) and the
RdSAP control-label vocabulary in MainheatControlAttributes.py. 2303 (the earlier
audit's guess) is rejected: it is a flat-rate code (DHW 1.05) whose oracle match
was a coincidence of two offsetting spec violations. The residual +2.0 to oracle
52 is the documented SAP-10.2-engine-vs-lodged offset, not a fuel/flags gap
(those were threaded by the #1590 follow-up) — supersedes the ADR-0053 /
HANDOVER_838 "community fuel/flags" attribution.
16 Bingley is the only heat-network fixture in portfolio 838, so this moves one
fixture strictly toward its oracle. Harness ratcheted: within-0.5 0.51→0.58,
MAE 0.625→0.521 (observed 58.5% / 0.520 with all three 2026-07-15 levers).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* PasHub SAP accuracy: restore 3 dropped §2 infiltration inputs (from_site_notes)
`from_site_notes` uniquely dropped three ventilation inputs that the gov-API
and Elmhurst sibling mappers all set, causing a systematic cohort-wide SAP
under-rate vs the company's own accredited SAP-10.2 certs
(property_baseline_performance.effective_sap_score, portfolio 838):
1. percent_draughtproofed — never set, so §2(15) window infiltration was
pinned at its 0.25-ACH worst case on every dwelling. Reconstructed as the
area-weighted % of draught-proofed windows (mirrors Elmhurst
`draught_proofing_percent`). Dominant term.
2. Upper-storey +0.25 m joist void — omitted; now added, matching
`_UPPER_FLOOR_HEIGHT_ADD_M` on the gov-API/Elmhurst paths. This
RE-ADJUDICATES #1601 ("keep raw"): that call was confounded by the
then-present draught-proofing drop suppressing every verified dwelling.
3. sheltered_sides — left None → calculator's flat default of 2, which
over-shelters end/semi/detached (RdSAP §S5 = 1/1/0). Now derived from
built form.
The three are NON-ADDITIVE — each overshoots alone (which is why all three
were previously rejected individually) — but together they land all 7
verified ground-truth dwellings toward truth (none regress) and every built
form near zero. Cohort 62.1% -> 83.3% within-0.5, MAE 0.507 -> 0.377.
Guardrails: gov-API RdSAP corpus unchanged (78.9%, these are from_site_notes-
only helpers). pashub harness 58.5% -> 79.5% / MAE 0.520 -> 0.389; ratchets
tightened 0.58->0.78 and 0.521->0.40. pyright zero-new (mapper baseline 39).
New focused tests in TestFromSiteNotesInfiltrationFixes cover all three
fields incl. area-weighting and the built-form shelter map; goldens updated.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Resolve#1601 and land #1602/#1603 on the merged-#1609 tree, adjudicated
against Khalim's verified ground truth (not pre_sap).
#1601 (upper-floor +0.25 m joist void) — RESOLVED as keep-raw. The
gov-API/Elmhurst mappers add 0.25 m to upper-storey heights because their
lodged height is a clear internal ceiling. Against verified truth RAW beats
+0.25 on all 7 verified dwellings (16 Stillwater raw -0.35 within-band vs
+0.25 -0.75; every verified property is already under truth and +0.25 only
lowers SAP). pashub surveys internal dimensions (202/205 "Measurements
Location: Internal") and its upper-ground height gap is modal 0.00, so the
joist void is not differentially present and a blanket +0.25 is unsafe.
_map_floor_dimensions keeps the raw surveyed height with a RESOLVED note.
#1602 — semi-exposed / exposed floor exposure. The surveyed "Floor type"
"Semi Exposed (unheated)" now sets is_above_partially_heated_space (RdSAP
§5.14 U=0.7) and "Exposed Floor" sets is_exposed_floor (§5.13 Table 20), on
the lowest storey (floor==0) only, mirroring the gov-API/Elmhurst siblings.
New strict-raise _pashub_floor_exposure (ADR-0015).
#1603a — alternative walls. New AlternativeWall survey dataclass +
extract_alternative_walls (the "Alternative Wall"->"Windows" section) +
_map_pashub_alternative_walls -> sap_alternative_wall_1/2. The cascade
deducts each alt-wall area from the part's main opaque wall (no double
count), so a mixed-facade dwelling is billed at each sub-area's own
construction. The alt-wall block lodges "As Built" (capital B) — aliased to
the existing default insulation code.
#1603b — extension floor construction. ExtensionConstruction gains a floor
block (parsed like the main building) and _map_extension_building_part now
threads floor_type/construction/insulation/u_value_known, which the main
path already did and the extension silently dropped.
Cohort: within-0.5 50.2% -> 51.2%, MAE 0.652 -> 0.624, 0 strict-raise
errors across all 205. Verified-truth safe: none of the 7 verified
dwellings have alt walls, and #1602 moves the one it touches (2 Philips
exposed ext floor) by -0.00. pyright 0-new (mapper baseline 39). Goldens
test_full_building_construction + end_to_end EXTENSION_1 updated.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Three silent-drop extraction fixes the gov-API/Elmhurst mappers already apply
but `from_site_notes` uniquely omitted — each let a favorable default reach the
SAP-10.2 calculator and over-rate the dwelling. Same calculator, so the whole
gap was extraction fidelity (gov-API corpus 78.6% within-0.5 vs pashub 23.9%).
#1598 — electric-shower + bath counts: `_map_sap_heating` built `shower_outlets`
but never set `electric_shower_count`/`mixer_shower_count`/`number_baths`, so
the cascade defaulted to 1 gas mixer / 0 electric, billing electric-shower hot
water off the cheap main system. 100/205 fixtures lodge "Electric Shower".
#1599 — floor label: pashub lodges "Ground Floor" (capital F); the calculator's
RdSAP §5(12) suspended-timber floor-infiltration gate is case-sensitive on
"Ground floor", so the 0.2-ACH term was silently dropped. Normalized at the
mapper boundary. 98/205 suspended-timber.
#1600 — water-heating "None": the RdSAP 10 §10.7 "no water heating system"
signal was discarded and HW inherited the gas combi (58 Hackle 67.7 vs
verified 59). Coded to WHC 999 so the existing electric-immersion + Table
28/29 default fires (also folds in #1594: blank cylinder size is no cylinder,
not a phantom one).
Guinness GMCA 205 cohort: within-0.5 23.9% -> 50.2% (103/205), MAE 1.410 ->
0.650. Ratchets tightened to 0.50 / 0.65. Verified vs Khalim's ground truth
(16 Stillwater 78.2 -> 75.7 vs 76). #1601 (upper-floor +0.25 m) held — it
empirically over-corrects this cohort (internal-vs-external dimension question,
under investigation). pyright: 0 new errors.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
