v0.23.0

[0.23.0] - 2026-08-12

Removed

• Context-size advisory retired (#181, decision recorded 2026-08-12).
  token_sentinel.py's third PostToolUse guard — the one that watched
  per-turn weighted tokens and suggested /compact on an oversized context —
  is removed, along with context_window(), MARC_CONTEXT_WINDOW,
  DEFAULT_CONTEXT_WINDOW, CONTEXT_WINDOW_FRACTION,
  MIN_CONTEXT_FRACTION_TO_WARN, hook_tokens_threshold(),
  MARC_TOKEN_GUARD_TOKENS_THRESHOLD, and the max_context snapshot added
  for it in #178. Claude Code's own harness already knows the real per-model
  context window, warns on it, and auto-compacts by default
  (autoCompactEnabled/autoCompactWindow) — a strictly better mechanism
  than a guard that could only guess the window and could never act itself.
  This is a removal, not a fix: the harness's native auto-compact supersedes
  it entirely. The --tokens manual CLI flag survives with a self-contained
  default (DEFAULT_CLI_TOKENS_THRESHOLD, still 130000) — it's an explicit,
  operator-invoked report column, not a silent hook assumption. The call-count
  runaway guard (#71) and the mid-session model-switch guard (#73) are
  unaffected; neither depended on the context window. See
  docs/marc/2026-08-12-decision-context-advisory-retired.md for the full
  decision record.