docs: link new topical guides from README Documentation section

Added pointers to the docs that landed in tonight's batches:

- internals-agent.md (shipped earlier this week — was missing from list)
- threat-model.md (#1904)
- production-hardening.md + regulated-deployment.md (#1919)
- comparison.md (#1906)
- interceptors.md (#1907 design draft — clearly tagged as not-yet-implemented)

No content changes; pure index update so readers can find the new
material from the canonical entry point.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Skobeltsyn

README.md

@@ -185,6 +185,12 @@ Topical guides:
 - [**Agent Memory**](docs/memory.md) — `memory(MemoryBank())`, the three auto-injected tools, sharing memory across agents.
 - [**Guided Generation**](docs/generation.md) — `@Generable`, `@Guide`, `@LlmDescription`, JSON-Schema generation, lenient deserializer, `PartiallyGenerated<T>`.
 - [**Composition Operators**](docs/composition.md) — `then`, `/`, `*`, `forum`, `.loop {}`, `.branch {}`, single-placement rule, type algebra.
+- [**InternalsAgent**](docs/internals-agent.md) — query agents-kt internals from your IDE via MCP (Cursor / Claude Desktop).
+- [**Threat Model**](docs/threat-model.md) — five deployment scenarios + anti-patterns; self-classify your use case in 5 min.
+- [**Production Hardening**](docs/production-hardening.md) — actionable checklist for "before going live."
+- [**Regulated Deployment**](docs/regulated-deployment.md) — capability inventory, action log, decision points; EU AI Act mapping.
+- [**Comparison**](docs/comparison.md) — Agents.KT vs LangChain / Semantic Kernel / AutoGen / raw MCP.
+- [**Interceptors (design draft)**](docs/interceptors.md) — `onBefore*` family + `Decision` sealed type; not yet implemented (#1907).
 - [**Roadmap**](docs/roadmap.md) — full Phase 1–4 feature plan.
 
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