v0.6.11

v0.6.11

First public build since v0.6.7, a weekend release wiring stuff that has long been waiting in a parallel branch

New: trace harness generalization (Wave 1, complete)

The headless trace harness (previously boot-then-load-one-tape only)
now works for arbitrary code and starting points:

• Trace from a raw .bin, a snapshot, or cold reset (ZTRACE_SETUP)
• Memory-read and port-write tracing
• Register-equality stop conditions and watchpoints, with automatic
  snapshot-on-trigger (.zxs/.z80/.sna) so a stopped state loads
  straight back for inspection
• Call-stack reconstruction (CALL/RST/RET/RETN/RETI, including
  conditional variants)
• Coverage summary mode
• Symbol-table-aware output, annotated against real zenas --sym builds

Fixed

• A disk-controller regression test depended on a sandbox-only file
  path and silently skipped everywhere else, including CI — replaced
  with a checked-in fixture built through the real FDC command interface.
  Full Changelog: v0.6.7...v0.6.11