feat: initialize Hypothesis Machine Pi extension

CHANGELOG.md

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+# Changelog
+
+## 0.1.1 — 2026-07-31
+
+- Added GitHub CI, CodeQL, Dependabot, contribution/security templates, and the
+  local release checklist.
+- Updated the development toolchain to ESLint 10 and aligned the minimum Node.js
+  version with Pi 0.83 (`22.19+`).
+- Added the official `ModelRegistry` compatibility path for Pi 0.78 while
+  retaining shared `ModelRuntime` behavior on Pi 0.83+.
+- Added `agent_end` continuation fallback for Pi versions predating
+  `agent_settled`.
+- Improved startup diagnostics and verified `/team` through Pi 0.78 RPC mode.
+- Fixed Redis container capabilities and verified a live Firecrawl v2 scrape.
+
+## 0.1.0 — 2026-07-31
+
+- Initial Pi extension package.
+- Recursive persistent AgentSessions and dynamic Markdown agent factory.
+- Tree limits, replication, messaging, cancellation, recovery, and `/team`.
+- Markdown/SQLite research memory and source provenance.
+- Local SearXNG/Firecrawl gateway with SSRF controls and cache.
+- Explicit bounded research loop.
+- Docker-only reproducible experiment runner.
+- Unit, integration, and extension smoke tests.