stop piling up idalib workers; raise max-workers headroom

Root cause of 'Maximum idalib worker count reached': the app bumped idle_ttl to
~never on every open, so sessions never freed and hit the default cap of 4.

- app: drop the immortal bump_idle_ttl(1e9); rely on the KeepAlive heartbeat
  (120s) to keep the running session warm, and open with a moderate idle_ttl
  (1800s) so the worker self-exits and frees its slot after the TUI closes.
- spawn.sh: set IDA_MCP_MAX_WORKERS (default 8) for headroom.
- doc: supervisor prunes unreachable workers before counting, so killing an idle
  worker frees a slot on the next open.

(Verified separately: big/truncated decompile results propagate renames fine via
the earlier force_recompile fix.)

1 files changed, 4 insertions, 1 deletions

diff --git a/spawn.sh b/spawn.sh
index 8bc0b6f..4b0c63c 100755
--- a/spawn.sh
+++ b/spawn.sh
@@ -1,2 +1,5 @@
 #!/bin/sh
-uv run idalib-mcp --host 127.0.0.1 --port 8745 $(pwd)/bin/ls
+# Start the ida-pro-mcp supervisor. IDA_MCP_MAX_WORKERS raises the ceiling on
+# concurrently-open binaries (default 4); idle workers self-exit and free slots.
+IDA_MCP_MAX_WORKERS="${IDA_MCP_MAX_WORKERS:-8}" \
+  uv run idalib-mcp --host 127.0.0.1 --port 8745 $(pwd)/bin/ls