优化skill，添加特征树、编辑窗口

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+# Counterbored Hole Creation Atomic Skill
+
+## When to use
+
+- A fastener hole needs a cylindrical recess so a socket head, cap screw head, or flat seating surface sits flush or below the top face.
+- The request mentions counterbore, counterbored hole, socket head screw, cap screw, recessed screw head, or flat-bottom screw seat.
+
+## Do not use when
+
+- The screw head requires a conical countersink rather than a cylindrical counterbore.
+- The feature is a bearing pocket, large cylindrical recess, decorative ring, or simple through hole.
+- The part has no fastener-seat function.
+
+## Recognition features
+
+- Through hole plus larger coaxial shallow cylindrical recess.
+- HoleWzd evidence for counterbored screw holes.
+- Descriptions mention recessed screw heads, socket head screws, counterbore depth, or flush mounting.
+- Often appears on mounting plates, brackets, flanges, and covers.
+
+## Core invariants
+
+- Counterbore axis and through-hole axis are identical.
+- Counterbore diameter must be larger than through-hole diameter.
+- Counterbore depth must be enough for the screw head but not cut through the part unless requested.
+- Create the hole as one standard feature when possible to preserve fastener intent.
+- Pattern the complete counterbored hole feature when repeated.
+
+## Parameter roles
+
+- `through_hole_diameter` defines screw clearance.
+- `counterbore_diameter` defines head clearance.
+- `counterbore_depth` defines head seating depth.
+- `fastener_size` defines standard screw selection.
+- `placement_point` defines hole center.
+- `end_condition` defines through, blind, or up-to-next behavior.
+
+## Construction sequence
+
+1. Select the mounting face where the screw head sits.
+2. Place the hole center from datums or pattern references.
+3. Create a counterbored hole feature with through diameter, counterbore diameter, and counterbore depth.
+4. Confirm the counterbore opens on the correct face.
+5. Pattern or mirror the full counterbored hole feature if repeated.
+6. Add small entrance chamfers only after the counterbore is correct.
+
+## Common failures
+
+- Modeling only a shallow large circle without the through hole.
+- Reversing the counterbore to the wrong side of the part.
+- Making counterbore and through-hole diameters equal.
+- Using countersink geometry for a socket head screw.
+- Patterning only the through hole and forgetting the recess.
+
+## Evidence summary
+
+- Latest run evidence: 49 accepted atomic insights matched counterbored hole creation.
+- Strong repeated names include `create_counterbored_hole`, `use_hole_wizard_for_counterbored_holes`, and `create_counterbore_hole_for_socket_head_screw`.
+- Frequent operations in the latest run: HoleWzd, Cut, LinearPattern, MirrorPattern, Chamfer.
+- Source model examples: 020555, 028735, 031527, 079425, 080632, 086114, 096301, 144289, 146696, 174675, 202122, 211326, 217613, 225627, 227232.
+- Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.
+
+## Retrieval metadata
+
+Triggers:
+- `counterbored hole`
+- `counterbore`
+- `socket head screw`
+- `cap screw`
+- `recessed screw head`
+
+Secondary triggers:
+- `flush screw`
+- `counterbore depth`
+- `counterbore diameter`
+- `mounting hole`
+- `fastener seat`
+
+Operation triggers:
+- `hole wizard counterbore`
+- `cut counterbore`
+- `pattern counterbored hole`
+- `chamfer hole edge`
+
+Exclusions:
+- `countersink`
+- `bearing pocket`
+- `decorative ring`
+- `plain through hole`