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/hse_example_risk_assessments.md

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+# HSE example risk assessments (qualitative hazard → control structure)
+
+Canonical, citable source document for the IACE qualitative hazard→control
+pattern. The UK HSE risk-assessment template and worked examples give an
+openly-licensed, **non-numeric** model of how a hazard is paired with existing
+controls and further actions — used by IACE to validate that each identified
+hazard has at least one mapped control/measure.
+
+## Source
+
+- **Source:** UK Health and Safety Executive (HSE)
+- **Doc:** *Risk assessment: Template and examples*, plus worked-example PDFs
+  (maintenance work in a factory; a warehouse)
+- **License:** Open Government Licence v3.0 (OGL v3) — reuse with attribution
+- **Attribution:** `Source: HSE risk-assessment template & examples, © Crown copyright, licensed under the Open Government Licence v3.0`
+- **Retrieved:** 2026-06
+- **URLs:**
+  - https://www.hse.gov.uk/simple-health-safety/risk/risk-assessment-template-and-examples.htm
+  - https://www.hse.gov.uk/simple-health-safety/assets/docs/factory.pdf
+  - https://www.hse.gov.uk/simple-health-safety/assets/docs/warehouse.pdf
+
+**Qualitative only:** the HSE method is deliberately **non-numeric** — it does not
+assign severity/probability scores or a risk matrix. It identifies hazards,
+records existing controls, and plans further action. (Numeric severity×probability
+comes from PRISM, see `prism_risk_methodology.md`.)
+
+## Assessment structure (7 fields)
+
+The HSE blank template is a single table with seven columns:
+
+| # | Column |
+|---|---|
+| 1 | What are the hazards? |
+| 2 | Who might be harmed and how? |
+| 3 | What are you already doing to control the risks? |
+| 4 | What further action do you need to take to control the risks? |
+| 5 | Who needs to carry out the action? |
+| 6 | When is the action needed by? |
+| 7 | Done (date completed) |
+
+Method: walk the workplace, note hazards, talk to workers/safety reps, record
+who could be harmed, list existing controls, then decide what more is needed.
+HSE stresses the examples are illustrative — "do not just copy an example."
+
+Named worked examples published: office-based business, local shop/newsagent,
+food preparation and service, motor vehicle repair shop, factory maintenance,
+warehouse.
+
+## Worked example — maintenance work in a factory (hazard → controls)
+
+| Hazard | Existing controls / further action (summary) |
+|---|---|
+| Machinery / equipment | Guards and emergency-stop buttons fitted; add operator training on lockout/isolation procedures. |
+| Slips, trips, falls | Housekeeping protocols in place; improve drainage and floor markings in work areas. |
+| Chemical exposure | Safety data sheets held; upgrade ventilation, provide respiratory protection where needed. |
+| Noise | Hearing protection supplied; assess noise levels, consider engineering controls at source. |
+| Manual handling | Mechanical lifting aids available; refresh safe-lifting training. |
+| Electrical | Maintenance staff qualified; set a formal inspection schedule and document lockout/tagout. |
+
+## Worked example — warehouse (hazard → controls)
+
+| Hazard | Existing controls / further action (summary) |
+|---|---|
+| Manual handling | Proper lifting techniques, mechanical aids, ergonomics training, weight limits. |
+| Storage & stacking | Appropriate racking, stable stacks, regular inspection, clear aisles / emergency routes. |
+| Falls from height | Guardrails on elevated platforms, fall-protection equipment, working-at-height training. |
+| Moving / powered equipment (FLTs) | Speed limits, segregated pedestrian zones, operator licensing, scheduled maintenance, visible warnings. |
+| Slips, trips & falls | Floors clean/dry, walkways clear, lighting, suitable footwear, prompt spill clean-up. |
+| Noise | Hearing protection where needed, noise barriers, equipment maintenance, sound-level monitoring. |
+
+## How these are used in IACE
+
+1. **Hazard → control completeness check:** the 7-field structure backs the IACE
+   rule that every identified hazard must carry at least one existing control and,
+   where residual risk remains, a further-action/measure entry.
+2. **Control vocabulary:** the worked-example hazard→control pairs seed IACE's
+   library of typical machinery/warehouse measures (guarding, LOTO, segregation,
+   manual-handling aids, PPE) for suggesting measures against a detected hazard.
+3. **Qualitative complement:** HSE supplies the *narrative* control side; PRISM
+   supplies the *numeric* severity×probability side — IACE combines both.
+
+No copyrighted standard text or table is reproduced; all content here is
+OGL-v3 Crown-copyright HSE material.