Agentic chat foundation and memory flow

[aiagate]

Summary

• Introduce agentic chat contracts, tool-call payloads, and chat query DTOs
• Rebuild memory storage/indexing and semantic sleep flow with migration support
• Add agent turn orchestration, tool execution, worker routing, Docker runtime wiring, script cleanup, and refreshed docs

Verification

• git diff --check origin/main..HEAD
• uv sync --frozen
• uv run --frozen ruff format --check .
• uv run --frozen ruff check .
• uv run --frozen pyright
• uv run --frozen pytest
• docker compose up --build -d
• docker compose ps
• docker compose logs migrate --no-log-prefix --tail=80

Notes

• Scenario tests remain skipped unless RUN_SCENARIO_TESTS=1 with live provider credentials.