v0.26.0

Added

• Every ## Guardrails field can be edited from mureo configure, under a
  readable name (#843). The Guardrails card (Advanced) now lists every
  rule below the currency dropdown with an English / Japanese label and
  one-line description, its current value, and whether it is not set or
  being ignored; saving writes only the bullets that changed and leaves the
  rest of STRATEGY.md byte-identical. New routes GET / POST /api/strategy/guardrails carry the same labels for web extensions, and
  mureo.policy.guardrail_fields.GUARDRAIL_FIELDS is the field catalog
  (kind, unit, range, i18n key) both are built from.

Fixed

• A non-finite ## Guardrails number is read as not declared (#843).
  A cap written as nan, inf or 1e999 used to parse as a float the
  gate compared against (nan > cap is always False, so a nan cap
  silently allowed everything). The same value in
  exclusion_impact_window_days made the section parse raise, and the
  gate, which fails open on a load error, then enforced none of the
  section's rules. Such a value now drops that one rule like any other
  unreadable number. Bullet lines are also split at \n only, as the
  section parser already did, so a U+2028 or \x85 inside a prose line
  no longer starts a bullet.
• STRATEGY.md writes keep the operator's title and preamble (#845).
  Every writer (write_strategy_file, mutate_strategy_file,
  add_strategy_entry, remove_strategy_entry, the state store, the
  configure Guardrails card and mureo_strategy_set) used to replace the
  file's title with # Strategy and drop any text before the first ##
  section. That text is now kept byte-for-byte; only a file with no preamble
  (a new file, or one that starts at a section) gets the default title.
  mureo_strategy_set keeps the title of the markdown it is given.
  render_strategy gains an optional preamble, write_strategy_file a
  preamble that defaults to keeping the existing file's, and the new
  strategy_preamble(text) returns the text before the first section.