优化skill，添加特征树、编辑窗口

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+# Flange Planning Skill
+
+## When to use
+
+- The request describes a circular flange, coupling flange, pipe flange, gasket-like flange, flanged sleeve, or flanged cylindrical adapter.
+- The part has a central axis, central bore, and fastener holes arranged around a pitch circle.
+- The flange connects, spaces, seals, or mounts coaxial parts such as shafts, pipes, bearings, covers, or couplings.
+
+## Do not use when
+
+- The word flange only means a side tab, flat ear, or rectangular mounting plate extension.
+- The hole layout is a rectangular grid, edge row, or arbitrary plate pattern.
+- The model is primarily a plain shaft, washer, pulley, bearing assembly, or bracket without a true circular flange body.
+
+## Recognition features
+
+- Axisymmetric disc, annular ring, raised hub, sleeve, stepped boss, or cylindrical landing surface.
+- Central through bore, pilot bore, counterbore, recess, seal land, or shaft clearance on the main axis.
+- Bolt holes are evenly spaced by angle around the same center as the bore.
+- Optional recesses, gasket grooves, chamfers, fillets, or counterbores are secondary to the coaxial flange body.
+
+## Core invariants
+
+- The outer diameter, bore, hub, sleeve, recesses, and bolt circle share one central construction axis.
+- Build the rotational body before cutting the bolt holes.
+- Define bolt-circle diameter separately from outer diameter and bore diameter.
+- Create one correct bolt hole, then circular-pattern the cut feature over 360 degrees.
+- Do not replace the bolt circle with a rectangular hole grid.
+- Keep fillets, chamfers, and cosmetic edge breaks late in the sequence.
+
+## Parameter roles
+
+- `outer_diameter` defines the flange envelope.
+- `thickness` defines the disc or flange plate depth.
+- `bore_diameter` defines shaft or pipe clearance.
+- `hub_diameter`, `hub_height`, and `pilot_diameter` define raised coaxial features.
+- `bolt_circle_diameter`, `bolt_count`, `bolt_hole_diameter`, and `start_angle` define the fastener pattern.
+- `counterbore_diameter`, `counterbore_depth`, `gasket_groove_width`, and `gasket_groove_depth` define secondary seats.
+
+## Construction sequence
+
+1. Establish the central axis and primary reference plane.
+2. Create the flange disc and any coaxial hub or sleeve using revolve for stepped profiles, or extrude circles for simple flat discs.
+3. Cut the central bore through the flange and hub on the same axis.
+4. Add one bolt hole at the pitch radius using the correct fastener hole type.
+5. Circular-pattern that cut around the central axis with equal angular spacing.
+6. Add recesses, gasket grooves, counterbores, chamfers, and fillets after the bore and bolt pattern are stable.
+
+## Common failures
+
+- Off-axis bore relative to hub or outer diameter.
+- Manual bolt hole placement that produces unequal angular spacing.
+- Confusing a rectangular mounting plate with a flange because both have multiple holes.
+- Forgetting the central bore and creating only a circular plate with holes.
+- Applying large fillets before the bolt pattern and causing feature failure.
+
+## Evidence summary
+
+- Current library evidence: 45 previously reviewed SCAD58 flange-like models.
+- Latest run evidence: accepted insights for circular flange bolt holes, circular pattern around a central bore, revolved axisymmetric bodies, and coaxial cylindrical features.
+- Frequent operations in the latest run: Revolution, Extrusion, Cut, HoleWzd, CircularPattern, Chamfer, Fillet.
+- Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.
+
+## Retrieval metadata
+
+Triggers:
+- `flange`
+- `circular flange`
+- `pipe flange`
+- `coupling flange`
+- `flanged sleeve`
+
+Secondary triggers:
+- `bolt circle`
+- `pitch circle`
+- `central bore`
+- `raised hub`
+- `gasket groove`
+- `pilot diameter`
+
+Operation triggers:
+- `revolve profile`
+- `extrude circular disc`
+- `cut central bore`
+- `circular pattern`
+- `counterbore bolt holes`
+
+Exclusions:
+- `mounting plate`
+- `rectangular hole grid`
+- `side tab`
+- `plain shaft`
+- `complete bearing`