agra b2ebf774bc ERR/E3.0 (slice 3e rung 2): iOS-simulator stepping verified ...

Closes out E3's stepping-verification ladder to the extent possible
headlessly.

- Verified `sx build --target ios-sim --emit-obj` produces an
  arm64-ios-simulator Mach-O that runs under `simctl spawn` and steps
  in lldb (the backtrace shows a dyld_sim frame — the sim runtime).
- Verified the device-applicable .dSYM path: dsymutil collects the
  DWARF, and after removing the .o lldb still resolves source via the
  .dSYM.
- debug_stepping_smoke.sh gains an optional iOS-sim rung that reuses an
  already-booted simulator (never boots one — single-sim policy) and
  exercises the .dSYM path; skips cleanly when no sim is booted.
- docs/debugger.md: rungs 1-2 marked verified; the iOS-device rung is
  documented as a manual checklist (needs hardware + get-task-allow
  signing) — no compiler gap, --emit-obj + standard Apple tools suffice.

E3 is functionally complete and verified across macOS + iOS-simulator.

2026-06-01 16:10:33 +03:00

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