Scope: manual hairdressing/barbering tools for cutting and curling hair, plus the small sundries used alongside them — cutting and thinning/texturizing shears; heated, no-heat, and chemical-perm rollers/rods; sectioning clips, pins, end papers, capes, neck strips, spray bottles. Excludes electric clippers/trimmers, razors/shavettes (own leaf: razor-blade-shaving-brush-bows), and combs/brushes (own leaf: Hair Combs & Brushes).

Seed:
1. The hair-shears equivalent of harvest date is blade steel grade + edge grind (convex vs bevel) — rarely stated plainly, decides cut quality and honing frequency, and is what the price actually buys.
2. An industrial designer notices the pivot/tension screw first: a precision-ground, consistently-adjustable screw is cheap in material but hard to manufacture, which is why budget shears feel loose within weeks while the blades themselves look identical.

Sources:
[wikipedia_scissors] https://en.wikipedia.org/wiki/Scissors — hair-cutting and thinning shears are named distinct grooming scissor types — fetched excerpt
[wikipedia_hair_roller] https://en.wikipedia.org/wiki/Hair_roller — roller diameter runs ~20mm-38mm; velcro rollers are self-holding, no heat/pins, ~15min hold — fetched excerpt
[wikipedia_permanent_wave] https://en.wikipedia.org/wiki/Permanent_wave — wrap method is spiral or croquignole; smaller rods make tighter curls; end papers used — fetched excerpt
[wikipedia_barber] https://en.wikipedia.org/wiki/Barber — barber equipment list includes neck paper/tape, combs, scissors, razors — fetched excerpt
[wikipedia_hair_dryer] https://en.wikipedia.org/wiki/Hair_dryer — US CPSC mandated ground-fault protection on hair dryers since 1991 — fetched excerpt
[wikipedia_iec_60335] https://en.wikipedia.org/wiki/IEC_60335 — IEC 60335 safety series; IEC 61855 covers hair-care appliance performance testing — fetched excerpt
[jaguar_scissors_abc] https://www.jaguar-solingen.com/en/pages/scheren-abc — defines convex/slightly-convex edge, offset/crane handles, screw tension, comfort ring, left-handed scissors — fetched excerpt
[jaguar_quality_factors] https://www.jaguar-solingen.com/en/pages/qualitaetsfaktoren — JAGLINOX and MC steel named as blade steel grades with different hardness — fetched excerpt
[jaguar_homepage] https://www.jaguar-solingen.com/en/ — modeling/thinning/left-handed scissors sold as distinct lines; "tool bags and capes" accessory category — fetched excerpt
[babyliss_hot_rollers_category] https://www.babylisspro.com/specialty-hot-rollers — roller sets sold by size (jumbo vs standard count); ionic/titanium-ceramic marketed — fetched excerpt
[babyliss_jumbo_roller_product] https://www.babylisspro.com/nano-titanium-professional-12-jumbo-roller-hot-rollers/BABNTCHV15.html — set ships with butterfly clips + color-coded clips; color-change ready sensor — fetched excerpt

Branches:
product_type -> shears: "Hair-cutting shears for trimming hair. Thinning shears for thinning..." (wikipedia_scissors) routes to shear_function.
product_type -> rollers_and_rods: hair roller / perm rod are distinct mechanisms per wikipedia_hair_roller + wikipedia_permanent_wave, routes to roller_heat_method.
product_type -> styling_accessories: Jaguar "tool bags and capes" + Babyliss butterfly/metal clips + barber neck paper are a separate sundries set, routes to accessory_subtype.
shear_function -> thinning_texturizing: "Thinning scissors with serrated blades on both sides" (jaguar_scissors_abc) routes to thinning_tooth_pattern.
roller_heat_method -> heated_electric: Babyliss heated ceramic-core sets route to barrel_core_material.
roller_heat_method -> no_heat_mechanical: velcro rollers "do not need heat... self-holding" (wikipedia_hair_roller) route to roller_surface_type.
roller_heat_method -> chemical_perm_rod: permanent-wave reducing lotion + rod wrap (wikipedia_permanent_wave) routes to perm_rod_winding_technique.

Noise (rows seen but not made facets):
- Price/weight-in-grams ("Balance" glossary entry on jaguar_scissors_abc is a judgement of handle/blade balance, not a stated spec number) — kept as a why_experts_care note on tang_handle_shape, not its own facet, since no listing states it numerically.
- Blade length in inches/cm — mentioned conceptually by every shear seller but no number was confirmed on either brand page this run; left out rather than inventing a range.
- Steam/molecular hot-roller systems (e.g. Caruso-style) — could not fetch a source this run; dropped rather than asserted.
- Exact roller barrel mm diameters — only a single-source range (wikipedia_hair_roller); kept as ordinal small/medium/large/jumbo sizing instead of a numeric range, per the no-range-without-two-sources rule.
- Rockwell hardness (HRC) numbers for shear steel — brand pages name steel grades (JAGLINOX, MC steel) but no HRC figure was found; left qualitative.

Corrections:
- validator: reference kind 'standard' -> 'standards_body' (schema enum); summary trimmed from 63 to 59 words; added missing cold_start_question to shear_handedness; shortened accessory_subtype's cold_start_question from 15 to 10 words.

Corrections (2026-10-26):
- blade_edge_grind: added hollow_grind, semi_integrated_edge, fully_integrated_edge values — jaguar_scissors_abc names all three ("The hollow grind creates a sharp cutting angle...particularly suitable for slice techniques"; "Semi-integrated cutting edge...partially integrated"; "Fully integrated cutting edge...transitions seamlessly") and they were missing from the values list.
- splits: added a 4th top-level split for accessory_subtype (clips/pins -> clip_or_pin_material, cape -> cape_fabric_type, paper/strip/spray -> dead end), fixing a split-role facet with a cold_start_question but no branch wiring.
- product_type split: added shear_function to the rollers_and_rods and styling_accessories branches' makes_irrelevant lists, which omitted it so it never deactivated outside the shears path.
- shear_function split: added makes_irrelevant: [blade_edge_grind] to the thinning_texturizing branch to mirror the cutting branch's [thinning_tooth_pattern].
- jaguar_quality_factors reference: corrected steel grade name from "JAGLINOX" to "SOLINOX" after re-fetching the live page, which names SOLINOX, not JAGLINOX; MC steel was already correct.
- vocabulary: added a "Duckbill clip" entry paired to accessory_subtype, matching the treatment already given to "Butterfly clip" and "End paper."
- handle_shape: changed source from listing to researched and backfill_cost from low to medium — offset/crane naming was only confirmed on a brand glossary page (jaguar_scissors_abc), not on generic retail listings, matching blade_edge_grind's tier.
- Rejected: Part F's Vario screw system gap (tension_adjustment_system) was not in the Required Fixes list, so left unchanged this pass.