The second half of the Vibration theory page derives point mobilities and
radiation efficiency from Cremer, Heckl and Petersson (Structure-borne sound,
Eq. 5.23 and Table 5.1) and Hopkins (Sound insulation, Eqs 2.227-2.230), and
ties the results to ISO 7626-1 mobility measurement and the ISO 7849 radiation
factor, yet the references frontmatter only listed Griffin and Mansfield. Add
the missing bibliography entries for those works so the rendered References
section matches what the prose actually cites.

Add the two table-of-contents anchors the theory index was missing for this
page: the point-mobility and radiation-efficiency section and the multiple-
shock subsection.

Mirror both changes into the Spanish pages with translated notes and labels.

* Add ISO 9053-1 static airflow-resistance report via .report()

Add a one-page PDF material airflow-resistance test report to
StaticAirflowResult, laid out like an accredited ISO 9053-1:2018
static/direct airflow-method certificate.

The fiche carries a standard-basis line, an optional metadata header
(client, manufacturer, specimen, specimen thickness, test facility,
date, climate), a two-panel body with a metrics table (the evaluation
velocity, the fitted pressure difference, the airflow resistance R, the
specific airflow resistance R_s, the airflow resistivity sigma when a
thickness is available, and the through-origin fit coefficients a and b)
beside the fitted pressure-drop curve, and a boxed specific airflow
resistance R_s with R and sigma alongside, all read at the clause 7.5
reference velocity of 0.5 mm/s. ISO 9053-1 is a material
characterisation, so the fiche carries no pass/fail verdict.

The renderer reuses the shared report layout and metadata container, and
renders in English and Spanish. A worked example is registered in the
report generator and its rendered fiche committed alongside the others.

* Document the plot dependency and use a language-neutral precision note

The static airflow-resistance fiche embeds the fitted curve, so state that
rendering needs both reportlab and matplotlib (phonometry[report,plot]) in the
English and Spanish guides and the materials doc. Describe the evaluation-velocity
precision as one decimal place rather than with a locale-specific separator, and
regenerate the API page.

* Extract the shared material-test fiche scaffold

The dynamic-stiffness (EN 29052-1 / ISO 9052-1) and static airflow-resistance
(ISO 9053-1) fiches share the same one-page shape: title and basis line,
metadata identity grid, a metrics table beside the result's self-scaling plot,
a boxed single-number result with extended terms, and the footer. Move that
common scaffold into a single _material_fiche helper (the content dataclass, the
identity-grid builder, the standard-basis-line helper and the renderer) and have
both fiches supply only their own labels, metric rows and boxed statement. The
rendered output is unchanged.

* Add element-normalized intensity insulation report via .report()

Add IntensityElementNormalizedResult.report(): a one-page PDF fiche for
the element-normalized level difference DI,n,e of a small building element
measured with sound intensity (ISO 15186-1:2000, Clause 3.9, Formula (8)).

DI,n,e is a level difference rated by the ISO 717-1 airborne machinery, the
same as the sibling intensity sound reduction index RI, so the fiche is
driven through the shared insulation skeleton (render_insulation_fiche) with
the shared iso717_columns_builder. It lives in the existing iso15186.py
renderer beside the RI fiche, so no second near-identical renderer is added.

The sheet carries the standard-basis line, an optional metadata header, the
per-band table (16 one-third-octave or 5 octave bands) beside the
measured-versus-shifted-reference curve, the boxed rating DI,n,e,w (C; Ctr)
and the intensity-method statement. verbose=True shows the ISO 717 evaluation
per band; a metadata requirement adds a PASS/FAIL verdict (the element
insulation passes at or above the target); language="es" renders the Spanish
fiche.

The example is anchored to the ISO 717-1:2020 Annex C worked-example curve
read as a documented DI,n,e spectrum, pinning the rating to the published
30 (-2; -3) dB through the intensity path without a new numeric oracle. It is
registered in the report generator with its committed PDF and WebP preview,
and the guides and API reference are updated.

* Share the intensity-report request validation helper

Extract the engine, language, rating-presence and band-count guards the two
ISO 15186-1 intensity report methods share into a single
_validate_intensity_report helper, mirroring the flanking-transmission module.
It returns the validated non-None rating so each report method hands it
straight to the renderer, removing the duplicated guard block.

* Regenerate API reference after rebase

* Add wind-turbine tonal audibility report via .report()

Add WindTurbineTonalityResult.report() rendering a one-page PDF
wind-turbine tonality-assessment fiche (IEC 61400-11:2012+A1:2018,
subclauses 9.5.2-9.5.5).

The sheet carries a standard-basis line, an optional metadata header
(source/situation, client, measurement position, instrumentation, date),
a two-panel body with the critical-band and masking analysis in a metrics
table (tone frequency, critical bandwidth, tone level L_pt, masking-noise
level L_pn, tonality dL_tn, audibility criterion L_a and tonal audibility
dL_a) beside the narrowband-spectrum plot with the critical band, masking
level and tone marked, and a boxed decisive tonal audibility dL_a with the
tone frequency and the audibility decision (a tone is audible when dL_a
exceeds 0 dB). A maximum acceptable tonal audibility supplied via the
metadata requirement adds a PASS/FAIL verdict (a lower audibility is
better). English and Spanish both render.

Register the example fiche, add structural and i18n tests, and regenerate
the committed example PDF, WebP preview and API reference.

* Base the audibility decision on the displayed rounded tonal audibility

The boxed result, verdict and decision text all commit to the tonal
audibility rounded as displayed, but the decision phrase and note branched
on the raw is_audible flag. A raw dL_a just above 0 dB that rounds to a
displayed 0.0 dB could therefore print a self-contradicting "0.0 dB > 0".
Derive the audibility decision from the same rounded value through a shared
helper, and add a boundary regression test.

* Add field and survey building-insulation reports via .report()

Give the field and survey building-insulation results a one-page PDF field
test report, reusing the shared ISO 717 insulation skeleton so each is a
per-band curve rated against a shifted reference:

- SurveyAirborneResult, SurveyImpactResult and SurveyFacadeResult (ISO
10052:2021 survey/control method, octave bands) report DnT (or R'), L'nT and
D2m,nT with their ISO 717 weighted single number and the survey-method
statement.
- FacadeInsulationResult (ISO 16283-3:2016 field facade, one-third-octave
bands) reports D2m,nT (default), D2m,n or R'45 with the D2m,nT,w (C; Ctr)
rating and the engineering-method statement.

Each sheet carries the standard-basis line, an optional metadata header, the
per-band table beside the measured-versus-shifted-reference curve, the boxed
single number, an optional requirement verdict (level differences and
reduction indices pass at or above the target, the impact level at or below
it) and a footer; verbose=True annexes the ISO 717 evaluation per band, and
both English and Spanish render.

The shared ISO 717 default/verbose columns builder is hoisted into the
insulation-fiche helper so the survey, field-facade and flanking renderers
drive a single implementation. Registers one committed example per report,
extends the field-insulation guide (EN and ES), and updates the changelog.

* Share the field engineering-method statement across the ISO 16283 specs

* Caption the survey table by its band set and state the facade rating per quantity

The ISO 10052 survey report hard-coded the octave-band table caption, so a
one-third-octave survey report (16 bands, which the survey API accepts) was
mislabelled; derive the caption from the reported curve length and cover it
with a one-third-octave regression test. Correct the facade report
description: it boxes the ISO 717 weighted rating of the reported quantity
(D2m,nT,w, D2m,n,w or R'45,w), not always D2m,nT,w.

* Add structural-vibration FRF reports via .report() (ISO 7626, ISO 10846)

Add a one-page PDF .report() fiche to the two structural-vibration
frequency-response result types.

MobilityResult.report() renders a mechanical-mobility measurement fiche
(ISO 7626-1:2011 frequency-response-function definitions; measurement per
ISO 7626-2:2015). Mechanical mobility is a continuous frequency-response
function, not an octave-band quantity, so the sheet presents it honestly as the
mobility magnitude spectrum |Y(f)| plus a compact table of the FRF's
characteristic points (the FRF type, driving-point or transfer, the frequency
range, the peak frequency, the peak mobility magnitude and the phase there),
with a boxed peak mobility |Y| at the frequency it occurs at. It is a
characterisation, so there is no pass/fail verdict.

TransferStiffnessResult.report() renders a dynamic-transfer-stiffness
characterisation fiche for a resilient element (ISO 10846-1:2008 definition;
determined by the direct method, ISO 10846-2:2008, or the indirect
blocking-mass method, ISO 10846-3:2002). The transfer stiffness is a continuous
frequency-response function, so the sheet presents it as the transfer-stiffness
level spectrum Lk(f) plus a compact table of characteristic points (the
determination method, the blocking mass for the indirect method, the frequency
range, and the low-frequency stiffness plateau |k2,1|, its level Lk and the loss
factor there), with a boxed low-frequency Lk. It too is a characterisation, with
no verdict.

Both fiches share a common FRF body (_report/_frf_fiche.py): the title and
basis line, the optional metadata header, the two-panel body with the
characteristic-point table beside the result's own spectrum plot, the boxed
representative value and the footer. English and Spanish both render; example
inputs reuse the modules' oracle-validated closed forms.

* Reuse the result loss_factor in the transfer-stiffness fiche

Share the single ISO 10846-1 (3.8) loss-factor definition by reading the
result's own loss_factor property at the low-frequency index, instead of
recomputing eta = Im/Re in the renderer.

* Drop the unused low-frequency frequency in the stiffness table

The characteristic-point table only needs the magnitude, level and loss
factor at the low-frequency plateau, not its frequency.

Add a one-page PDF .report() to the two reverberation result types.

ReverberationModelResult.report() renders a design-stage prediction of the
reverberation time by the five classical statistical-acoustics models (Sabine,
Eyring, Millington-Sette, Fitzroy and Arau-Puchades): a per-band table with one
reverberation-time column per model beside the model comparison plot, and a
boxed mid-frequency reverberation time from Arau-Puchades with the per-model
spread alongside. It is labelled a prediction, not a measurement: the five
models bracket the reverberation time likely to occur, so no PASS/FAIL verdict
is emitted; a target reverberation time is printed as a reference line only.

ReverberationResult.report() renders an enclosed-space characterisation
(EN 12354-6:2003): a per-band table of the equivalent sound absorption area A
and the reverberation time T beside the reverberation-time plot, the room
volume and object fraction in the header, and a boxed mid-frequency
reverberation time with the mid-frequency absorption area alongside. A target
reverberation time is likewise printed as a reference line without a verdict,
since a room reverberation time is a target range rather than a strictly
higher/lower-is-better quantity.

Both renderers live in a shared _report/reverberation.py module (shared
mid-frequency descriptor, time formatting, octave-band table and header grid
helpers). Add the English and Spanish fixed strings, one committed example
fiche per result under .github/reports/, structural and value-presence tests
in English and Spanish, and the guide sections in both languages. Regenerate
the API reference.

* Add ISO 1999 noise-induced hearing-loss prediction reports via .report()

Add one-page PDF prediction fiches to the two occupational-hearing-loss
result types of the ISO 1999:2013 module. Both sheets are clearly labelled
statistical predictions for a noise-exposed population, not clinical
diagnoses of any individual.

NiptsResult.report() renders the noise-induced permanent threshold shift
(clause 6.3): a prediction-basis line, an optional metadata header, a
per-audiometric-frequency table of the median N50 and the NIPTS at the chosen
population fractile beside the shift spectrum, and a boxed representative shift
averaged over the 2/3/4 kHz hearing-handicap set with the exposure conditions.
verbose=True adds the upper/lower spread columns.

HtlanResult.report() renders the hearing threshold level associated with age
and noise (clause 6.1): a per-audiometric-frequency table of the age component
H, the noise component N and the combined threshold H' = H + N - H*N/120
beside the plot, and a boxed representative combined threshold. verbose=True
adds the H*N/120 compression term.

A maximum acceptable representative value supplied through the metadata
requirement adds a PASS/FAIL verdict (a lower value is better); without it
neither fiche prints a verdict. Both fiches render in English and Spanish.

Register one example per fiche, add structural and number-presence tests in
both languages, and regenerate the API reference and the committed example
artifacts.

* Drop the unused caption style from the prediction-notes helper

The shared ISO 1999 prediction-notes block builds its own muted paragraph
style, so it never used the caption style threaded in from the callers.

* Add ISO 9613-2 outdoor-propagation prediction reports via .report()

Add one-page PDF prediction fiches to the two outdoor-propagation result
types and a shared ISO 9613-2 family renderer.

OutdoorAttenuation.report() renders the octave-band attenuation breakdown
(divergence, atmospheric, ground and barrier terms with the total A), the
source power level and the downwind level LfT(DW), the attenuation-breakdown
plot and a boxed A-weighted downwind level LAT(DW) at the receiver. The sheet
is clearly labelled a prediction, not a measurement, and states the
meteorological and ground assumptions. A declared limit level via the metadata
requirement adds a PASS/FAIL verdict (a lower level is better). To carry the
composed level, outdoor_propagation_attenuation now accepts an optional
sound_power_level (with directivity_index, d_omega and c0).

BarrierInsertionLoss.report() renders the per-band insertion loss, the
insertion-loss spectrum and a boxed mean insertion loss over the octave bands.
Its basis line names the actual diffraction model used (the wave-theoretic
rigid-screen solution or the Kurze-Anderson closed form), a wave-acoustics
complement to the tabulated ISO 9613-2 screening term. A minimum required
insertion loss via requirement adds a PASS/FAIL verdict (higher is better).

Both fiches render in English and Spanish, register an example each under
.github/reports, are covered by structural and number-presence tests, and are
showcased in the Outdoor Sound Propagation guide.

* Regenerate API reference for the outdoor propagation report method

* Move the outdoor-propagation receiver level to a report-time SourceEmission

Keep outdoor_propagation_attenuation a pure attenuation calculation (its
signature is unchanged) and expose the downwind receiver level through a new
frozen SourceEmission object passed to OutdoorAttenuation.report(). When a
source emission is supplied the fiche lists the source power and the downwind
level and boxes the A-weighted downwind level at the receiver; without it the
fiche boxes the octave-band range of the total attenuation. The receiver-level
composition stays in the shared _compose_receiver_level helper.

Hoist the result and object construction out of the pytest.raises blocks in the
report tests so only the failing call is inside.

* Re-trigger CI for the outdoor-propagation report changes

* Restore Spanish diacritics and correct the composition-helper docstring

Add the missing accents to the two Spanish requirement comments in the outdoor
propagation guide, and update the receiver-level helper docstring: the level is
composed at report time from a SourceEmission, not stored on the attenuation
result, so drop the stale reference to the factory storing it.

* Drop the stray npm lockfile from the site

The site uses pnpm (pnpm-lock.yaml); an npm package-lock.json was generated
by accident during the site build and does not belong in the tree.