feat(iace): open-source safety KB sources + bp_iace_safety_kb (Thema 2)

Versioned, license-tagged source docs for the multi-layer GT knowledge base,
ingested into the new core RAG collection bp_iace_safety_kb (whitelisted in
the RAG search handler):
- prism_risk_methodology.md — OPSS PRISM v2 (OGL v3): full severity(4)×
  probability(8) → risk-level matrix (Serious/High/Medium/Low), RAPEX-aligned.
- cobot_biomech_limits.md — CC BY 4.0 papers (Behrens 2022 / Park 2019):
  force (N) & pressure (N/cm²) pain thresholds by body region (the data behind
  ISO/TS 15066, cited from the open papers — standard tables NOT reproduced).
- hse_example_risk_assessments.md — HSE (OGL v3): qualitative hazard→control.
- osha_robot_safety.md — OSHA OTM (public domain): 250 mm/s teach anchor,
  robot hazard taxonomy, safeguarding hierarchy.

No DIN/EN/ISO/IEC/DGUV content reproduced; each doc states its license + attribution.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ai-compliance-sdk/internal/iace/datasources/osha_robot_safety.md

@@ -0,0 +1,49 @@
+# Industrial & collaborative robot safety (OSHA, US public domain)
+
+Citable source document for the IACE robot/cobot hazard taxonomy and the
+reduced-speed anchor. US Government work — free to reuse verbatim.
+
+## Source
+
+- **Source:** US OSHA — Technical Manual (OTM), Section IV, Chapter 4: Industrial Robots & Robot System Safety; and OSHA Guidelines for Robotics Safety (STD 01-12-002)
+- **License:** US Government work — **public domain** (17 U.S.C. §105)
+- **Attribution:** `Source: US OSHA Technical Manual §IV ch.4 / STD 01-12-002, public domain`
+- **Retrieved:** 2026-06
+- **URLs:** https://www.osha.gov/otm/section-4-safety-hazards/chapter-4 · https://www.osha.gov/enforcement/directives/std-01-12-002
+
+## Reduced / teach-mode speed limit
+
+OSHA states (quoting the ANSI/RIA basis): during teach/manual mode, robot speed
+should be at a **reduced speed of 10 inches per second (250 mm/s) or less** at the
+tool center point. This is the public, citable basis for the IACE 250 mm/s teach
+anchor (matches the GT Bremse session and engine measure M340/M492).
+
+## Robot hazard taxonomy
+
+| Hazard | Description |
+|---|---|
+| Impact / collision | Unpredicted movement, component malfunction, unexpected program changes |
+| Crushing / trapping | Operator trapped between robot arm and fixed structure; pinch points |
+| Struck-by (mechanical part) | Failure of gripper/end-effector; ejected workpiece, tool or debris |
+| Electrical / hydraulic / pneumatic | Stored energy, high-pressure fluid injection, energized parts |
+| Slip / trip / fall | Around the cell, cabling, fluids |
+| Environmental | Arc flash, fumes, noise, radiation depending on process |
+
+## Safeguarding hierarchy (OSHA / ANSI basis)
+
+Fixed barriers → interlocked guards → presence-sensing (light curtains, area
+scanners, safety mats) → enabling/hold-to-run devices in teach mode → speed-and-
+separation monitoring (collaborative) → power-and-force limiting (collaborative)
+→ awareness barriers/signs. Energy isolation (lockout/tagout) for maintenance.
+
+## How these are used in IACE
+
+1. **Reduced-speed anchor:** the 250 mm/s teach limit is a public-domain anchor
+   for robot/cobot speed-limiting measures (no copyrighted standard needed).
+2. **Hazard taxonomy:** seeds the robot/cobot hazard categories (impact, crush,
+   struck-by, energy) for pattern coverage checks.
+3. **Safeguarding hierarchy:** orders the protective-measure suggestions for
+   robot cells (barriers → sensing → enabling → SSM/PFL → LOTO).
+
+For the collaborative force/pressure LIMITS see `cobot_biomech_limits.md`
+(CC BY 4.0 papers); ISO/TS 15066 tables are not reproduced.