actop 1.4.16

Changed

• Lint: unpin ruff and bring the tree into 0.16 compliance, lifting the
  >=0.15,<0.16 cap that 1.4.14 added as a stopgap when 0.16.0's expanded
  default rule set turned a previously-clean tree into 126 errors. The rule
  families are now codified in [tool.ruff.lint] rather than inherited from
  ruff's defaults, so a future default-select expansion can't break the CI gate
  again. Deliberately not selected: BLE/S (the native ctypes/IOKit/SMC reads
  intentionally catch broad Exception and fail silent) and EXE/PLW (skill
  and scratch helper scripts). RUF001-003 are ignored because the TUI
  intentionally uses —, ·, × and braille; RUF012 because Textual's
  BINDINGS = [...] is the framework idiom. No runtime or API change — the
  code edits are mechanical modernizations (endswith tuples,
  dict.fromkeys, comprehension and import cleanups).

Fixed

• docs/DESIGN-system.md: repair the VMStatistics64 example, whose elision
  markers had been collapsed into the field list (...("compressor_page_count", ...) on one line, plus a stray ...,), leaving the snippet syntactically
  invalid.