fix: resolve 5 ruff lint errors blocking CI (unused imports + import order)

[Copilot]

PR #10 introduced control flow, DecisionTrace, IPIITranspiler, and expanded GuruMatrix cells — all 191 tests pass, but the quality CI job fails on ruff before tests even run.

Changes

• src/compiler/context_analyzer.py — drop unused BlockNode import
• src/gurudev/ipii/transpiler.py — drop unused from typing import Any and unused Intent from intent_analyzer import
• src/gurumatrix/cells.py — drop unused Optional from typing import
• src/runtime/gurudvm.py — fix I001: reorder imports so stdlib (typing) precedes local (gurumatrix)

# before
from typing import Any, Dict, List, Optional
from gurumatrix.core import Dominio, GuruMatrix, Ontologia  # I001

# after (ruff-sorted)
from typing import Any, Dict, List, Optional

from gurumatrix.core import Dominio, GuruMatrix, Ontologia