feat: add DWARF backtrace command#218
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Add the bt/backtrace script command with DWARF CFI unwinding, tail-call continuations for deep stacks, protocol ABI records, user-space rendering, configuration, docs, and focused e2e coverage. Track the tail-call slots that actually executed for each event so conditional bt statements do not finalize stale per-CPU state. Preserve the physical frame count separately from inline display rows so TUI headers remain accurate.
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Add the bt/backtrace script command with DWARF CFI unwinding, tail-call continuations for deep stacks, protocol ABI records, user-space rendering, configuration, docs, and focused e2e coverage.
Track the tail-call slots that actually executed for each event so conditional bt statements do not finalize stale per-CPU state. Preserve the physical frame count separately from inline display rows so TUI headers remain accurate.