优化skill，添加特征树、编辑窗口

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+# Bearing Housing Or Seat Planning Skill
+
+## When to use
+
+- The request describes a bearing housing, bearing seat, bearing support, bearing block, pillow-block-like support, bushing seat, shaft support, or retainer body.
+- The central functional feature is a precise coaxial bore, pocket, sleeve, shoulder, or counterbore that locates a bearing or bushing.
+- The part is a single machined component that supports a shaft or bearing, not the rolling bearing assembly itself.
+
+## Do not use when
+
+- The user asks for a complete bearing with balls, rollers, cage, inner race, and outer race.
+- The bearing word is only speculative and there is no bore, seat, sleeve, pocket, or retaining geometry.
+- The part is mainly a flange, washer, simple tube, or rectangular plate with unrelated holes.
+- The task requires an assembly of shaft, bearing, seals, fasteners, and housing together.
+
+## Recognition features
+
+- Coaxial shaft clearance bore through the body.
+- Larger bearing pocket or counterbore with controlled depth.
+- Shoulder, step, retaining lip, snap-ring groove, or cover seat to locate the bearing axially.
+- Mounting base, side lugs, flange, bolt holes, ribs, or bosses can appear, but they support the bearing axis rather than define the part family.
+- Chamfers at bore entrances and seat edges guide assembly.
+
+## Core invariants
+
+- Bearing seat diameter, shaft clearance diameter, housing outside diameter, and cover features share one axis.
+- Separate the bearing outer-diameter seat from the shaft clearance bore; they are not the same feature.
+- Leave a shoulder or defined depth when the bearing must stop axially.
+- Build enough housing material before cutting the bearing pocket.
+- Add mounting holes and ribs after the main bore/seat relationship is established.
+- Do not model balls or rollers unless the prompt explicitly asks for a bearing assembly.
+
+## Parameter roles
+
+- `bearing_outer_diameter` defines the pocket or seat diameter.
+- `shaft_clearance_diameter` defines the through bore.
+- `seat_depth` defines how far the bearing is inserted.
+- `shoulder_height` or `shoulder_diameter` defines axial retention.
+- `housing_wall_thickness` controls material around the bearing pocket.
+- `mounting_hole_pattern`, `base_length`, `base_width`, and `base_thickness` define attachment to the frame.
+- `rib_thickness` and `rib_height` define optional support ribs.
+
+## Construction sequence
+
+1. Define the bearing axis and choose the housing form: block, flanged seat, sleeve, pedestal, or bracketed support.
+2. Create the main housing/body with enough wall thickness around the bearing axis.
+3. Cut the through shaft clearance bore on the main axis.
+4. Cut the bearing pocket/counterbore to its seat depth, leaving a clear shoulder where needed.
+5. Add retaining grooves, cover recesses, set-screw holes, oil holes, or alignment features only if requested.
+6. Add base mounting holes, bolt pads, ribs, and bosses using datum-driven positions.
+7. Finish with bore lead-in chamfers, outside chamfers, and small fillets.
+
+## Common failures
+
+- Generating a bearing assembly instead of a housing or seat part.
+- Making the bearing seat and shaft clearance the same diameter.
+- Missing the shoulder/depth that locates the bearing.
+- Off-axis mounting of bore, pocket, or outer sleeve.
+- Turning every bearing support into a flange even when the evidence suggests a block or pedestal.
+- Adding decorative ribs or fasteners that obscure the bearing pocket.
+
+## Evidence summary
+
+- Current library evidence: 24 previously reviewed SCAD58 bearing housing/seat descriptions.
+- Latest run evidence: accepted insights for central bore alignment, bearing/bushing-like cylindrical seats, coaxial features, counterbores, mounting holes, and chamfered bore entries.
+- Frequent operations in the latest run: Extrusion, Revolution, Cut, RevCut, HoleWzd, Chamfer, Fillet.
+- Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.
+
+## Retrieval metadata
+
+Triggers:
+- `bearing housing`
+- `bearing seat`
+- `bearing support`
+- `bearing block`
+- `bushing seat`
+
+Secondary triggers:
+- `bearing bore`
+- `bearing pocket`
+- `shaft clearance`
+- `retaining shoulder`
+- `coaxial seat`
+- `pillow block`
+
+Operation triggers:
+- `cut coaxial bore`
+- `counterbore bearing seat`
+- `create shoulder`
+- `add mounting base holes`
+- `chamfer bore entry`
+
+Exclusions:
+- `complete rolling bearing`
+- `plain washer`
+- `flange only`
+- `simple tube`
+- `shaft only`