Feat/conversation memory v2

[mfafore22]

Description

Adds conversation memory (multi-turn history) to the chat pipeline, backed by a LangGraph checkpointer, and wires it through to the SvelteKit chat UI.

• Backend: new backend/app/memory/ module (checkpointer + graph), SSE event handling (backend/app/sse_events.py), streaming/chat route updates to pass conversation history through
• Frontend: chat-state.svelte.ts and API client/types updated to carry conversation state across turns
• Adds langgraph-checkpoint-postgres / psycopg dependencies for persistence

Checklist

• I ran the relevant service test suite(s) and all tests pass
• I ran uv run --directory tapio prek run --all-files and addressed any issues
• I ran the package-local mypy and Pyrefly commands documented in CONTRIBUTING.md and addressed any issues
• New/changed code meets the project's 80% coverage guideline (uv run pytest --cov=tapio)
• I updated README.md if this PR changes user-facing behavior

Related issue

Additional context

This branch was pushed as feat/conversation-memory-v2 instead of continuing feat/conversation-memory because the remote branch has an independent commit (97227fa) implementing the same memory feature against the old pre-restructure tapio/ layout — that needs to be reconciled separately rather than silently merged.

[github-actions]

CI Results

Service	Check	Result
crawler	ruff (lint)	✅ Passed
crawler	mypy	✅ Passed
crawler	pyrefly	✅ Passed
crawler	pytest + coverage	✅ Passed
ingest	ruff (lint)	✅ Passed
ingest	mypy	✅ Passed
ingest	pyrefly	✅ Passed
ingest	pytest + coverage	✅ Passed
backend	ruff (lint)	✅ Passed
backend	mypy	✅ Passed
backend	pyrefly	✅ Passed
backend	pytest + coverage	✅ Passed
app	lint (eslint + prettier)	✅ Passed

All checks passed. 🎉

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: aa5e911e-8e05-48ef-900a-afb897ed466b

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[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud