fix: enforce strict ruff lint (17 rule sets) across entire repo

- Expand ruff config from E/F to 17 rule sets (B, RUF, SIM, PIE, T20,
  ARG, ERA, A, BLE, RET, ISC, TCH, UP, C4, PERF)
- Fix 907 lint errors across all Python files (GUI, FPGA cosim,
  schematics scripts, simulations, utilities, tools)
- Replace all blind except-Exception with specific exception types
- Remove commented-out dead code (ERA001) from cosim/simulation files
- Modernize typing: deprecated typing.List/Dict/Tuple to builtins
- Fix unused args/loop vars, ambiguous unicode, perf anti-patterns
- Delete legacy GUI files V1-V4
- Add V7 test suite, requirements files
- All CI jobs pass: ruff (0 errors), py_compile, pytest (92/92),
  MCU tests (20/20), FPGA regression (25/25)

pyproject.toml

@@ -24,4 +24,28 @@ target-version = "py312"
 line-length = 100
 
 [tool.ruff.lint]
-select = ["E", "F"]
+select = [
+    "E",    # pycodestyle errors
+    "F",    # pyflakes (unused imports, undefined names, duplicate keys, assert-tuple)
+    "B",    # flake8-bugbear (mutable defaults, unreachable code, raise-without-from)
+    "RUF",  # ruff-specific (unused noqa, ambiguous chars, implicit Optional)
+    "SIM",  # flake8-simplify (dead branches, collapsible ifs, unnecessary pass)
+    "PIE",  # flake8-pie (no-op expressions, unnecessary spread)
+    "T20",  # flake8-print (stray print() calls — LLMs leave debug prints)
+    "ARG",  # flake8-unused-arguments (LLMs generate params they never use)
+    "ERA",  # eradicate (commented-out code — LLMs leave "alternatives" as comments)
+    "A",    # flake8-builtins (LLMs shadow id, type, list, dict, input, map)
+    "BLE",  # flake8-blind-except (bare except / overly broad except)
+    "RET",  # flake8-return (unreachable code after return, unnecessary else-after-return)
+    "ISC",  # flake8-implicit-str-concat (missing comma in list of strings)
+    "TCH",  # flake8-type-checking (imports only used in type hints — move behind TYPE_CHECKING)
+    "UP",   # pyupgrade (outdated syntax for target Python version)
+    "C4",   # flake8-comprehensions (unnecessary list/dict calls around generators)
+    "PERF", # perflint (performance anti-patterns: unnecessary list() in for loops, etc.)
+]
+
+[tool.ruff.lint.per-file-ignores]
+# Tests: allow unused args (fixtures), prints (debugging), commented code (examples)
+"test_*.py" = ["ARG", "T20", "ERA"]
+# Re-export modules: unused imports are intentional
+"v7/hardware.py" = ["F401"]