fix(dap): keep evaluator registry when continuing all processes

[lukaszsamson]

Problem

The debug adapter crashes evaluate requests with:

** (KeyError) key :evaluator not found in:

    %{
      #PID<0.785.0> => %ElixirLS.DebugAdapter.Server.PausedProcess{...}
    }
    debug_adapter/server.ex:1647: anonymous fn/2 in ElixirLS.DebugAdapter.Server.handle_request/2

init/1 seeds paused_processes with a synthetic :evaluator entry that holds the variable references produced by evaluate requests. maybe_continue_other_processes/2 then wiped the whole map with %{state | paused_processes: %{}} when resuming all threads, so any later evaluate request hit Map.fetch!(state.paused_processes, :evaluator) and raised. That matches the crash dumps, which show a map containing only a real pid — one that was added after the wipe.

The same loop also called :int.continue(:evaluator) on that atom key, logging a spurious :int failure on every continue.

Changes

• maybe_continue_other_processes/2 preserves the :evaluator entry (Map.take(..., [:evaluator])) and only calls :int.continue/1 for real pids (is_pid/1 guard).
• The evaluate handler's lookup is defensive: a missing :evaluator entry falls back to a fresh registry instead of raising.

Testing

Added test "evaluate expression after continuing all processes" — pause on a dbg breakpoint, continue all threads, then evaluate. Without the server fix it reproduces exactly the reported error (internalServerError / ** (KeyError) key :evaluator not found in: %{#PID<...> => %PausedProcess{...}}); with the fix it passes.

Full apps/debug_adapter suite (--include fixture): 134/138 passed, 1 skipped. The 4 failures (basic debugging, multiple paused processes, continue without singleThread resumes all paused processes, breakpoints breakpoint in protocol) also fail on an unmodified tree in my environment — they all depend on :int line breakpoints, which don't trigger on Elixir 1.21.0-dev / OTP 28 locally. Pre-existing and unrelated, but it does mean the :int-breakpoint continue path wasn't exercised locally; only the dbg continue path was. CI should cover the rest.

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