feat: migrate to Poetry, fix Docker build, and resolve 6 UI/backend bugs (#92)

Migrate from Hatchling to Poetry for dependency management, fixing the
Docker build failure caused by .dockerignore excluding README.md that
Hatchling needed for metadata. Poetry export strategy bypasses this
entirely. Creative extras removed from main build (separate service).

Docker changes:
- Multi-stage builds with poetry export → pip install
- BuildKit cache mounts for faster rebuilds
- All 3 Dockerfiles updated (root, dashboard, agent)

Bug fixes from tester audit:
- TaskStatus/TaskPriority case-insensitive enum parsing
- scrollChat() upgraded to requestAnimationFrame, removed duplicate
- Desktop/mobile nav items synced in base.html
- HTMX pointed to direct htmx.min.js URL
- Removed unused highlight.js and bootstrap.bundle.min.js
- Registered missing escalation/external task handlers in app.py

Co-authored-by: Alexander Payne <apayne@MM.local>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Makefile

@@ -1,44 +1,28 @@
-.PHONY: install install-bigbrain install-creative dev nuke fresh test test-cov test-cov-html watch lint clean help \
+.PHONY: install install-bigbrain dev nuke fresh test test-cov test-cov-html watch lint clean help \
         up down logs \
         docker-build docker-up docker-down docker-agent docker-logs docker-shell \
         cloud-deploy cloud-up cloud-down cloud-logs cloud-status cloud-update
 
-VENV        := .venv
-PYTHON      := $(VENV)/bin/python
-PIP         := $(VENV)/bin/pip
-PYTEST      := $(VENV)/bin/pytest
-UVICORN     := $(VENV)/bin/uvicorn
-SELF_TDD    := $(VENV)/bin/self-tdd
+PYTEST      := poetry run pytest
+UVICORN     := poetry run uvicorn
+SELF_TDD    := poetry run self-tdd
+PYTHON      := poetry run python
 
 # ── Setup ─────────────────────────────────────────────────────────────────────
 
-install: $(VENV)/bin/activate
-	$(PIP) install --quiet -e ".[dev]"
+install:
+	poetry install --with dev
 	@echo "✓ Ready. Run 'make dev' to start the dashboard."
 
-install-bigbrain: $(VENV)/bin/activate
-	$(PIP) install --quiet -e ".[dev,bigbrain]"
+install-bigbrain:
+	poetry install --with dev --extras bigbrain
 	@if [ "$$(uname -m)" = "arm64" ] && [ "$$(uname -s)" = "Darwin" ]; then \
-	    $(PIP) install --quiet "airllm[mlx]"; \
+	    poetry run pip install --quiet "airllm[mlx]"; \
 	    echo "✓ AirLLM + MLX installed (Apple Silicon detected)"; \
 	else \
 	    echo "✓ AirLLM installed (PyTorch backend)"; \
 	fi
 
-install-creative: $(VENV)/bin/activate
-	$(PIP) install --quiet -e ".[dev,creative]"
-	@if [ "$$(uname -m)" = "arm64" ] && [ "$$(uname -s)" = "Darwin" ]; then \
-	    echo "  Apple Silicon detected — installing PyTorch with Metal (MPS) support..."; \
-	    $(PIP) install --quiet --pre torch torchvision torchaudio \
-	        --index-url https://download.pytorch.org/whl/nightly/cpu; \
-	    echo "✓ Creative extras installed with Metal GPU acceleration"; \
-	else \
-	    echo "✓ Creative extras installed (diffusers, torch, ace-step)"; \
-	fi
-
-$(VENV)/bin/activate:
-	python3 -m venv $(VENV)
-
 # ── Development ───────────────────────────────────────────────────────────────
 
 dev: nuke
@@ -63,7 +47,7 @@ nuke:
 # Ensures no stale code, cached layers, or old DB state persists.
 fresh: nuke
 	docker compose down -v --rmi local 2>/dev/null || true
-	docker compose build --no-cache
+	DOCKER_BUILDKIT=1 docker compose build --no-cache
 	mkdir -p data
 	docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d
 	@echo ""
@@ -158,14 +142,14 @@ pre-commit-run:
 up:
 	mkdir -p data
 ifdef DEV
-	docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d --build
+	DOCKER_BUILDKIT=1 docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d --build
 	@echo ""
 	@echo "  ✓ Timmy Time running in DEV mode at http://localhost:8000"
 	@echo "    Hot-reload active — Python, template, and CSS changes auto-apply"
 	@echo "    Logs: make logs"
 	@echo ""
 else
-	docker compose up -d --build
+	DOCKER_BUILDKIT=1 docker compose up -d --build
 	@echo ""
 	@echo "  ✓ Timmy Time running at http://localhost:8000"
 	@echo "    Logs: make logs"
@@ -181,7 +165,7 @@ logs:
 # ── Docker ────────────────────────────────────────────────────────────────────
 
 docker-build:
-	docker build -t timmy-time:latest .
+	DOCKER_BUILDKIT=1 docker build -t timmy-time:latest .
 
 docker-up:
 	mkdir -p data
@@ -261,9 +245,8 @@ help:
 	@echo ""
 	@echo "  Local Development"
 	@echo "  ─────────────────────────────────────────────────"
-	@echo "  make install          create venv + install dev deps"
+	@echo "  make install          install deps via Poetry"
 	@echo "  make install-bigbrain install with AirLLM (big-model backend)"
-	@echo "  make install-creative install with creative extras (torch, diffusers)"
 	@echo "  make dev              clean up + start dashboard (auto-fixes errno 48)"
 	@echo "  make nuke             kill port 8000, stop containers, reset state"
 	@echo "  make fresh            full clean rebuild (no cached layers/volumes)"