chore(examples): accept argv override and bump RPC timeouts

Three small ergonomic fixes uncovered while running every learning
example end-to-end:

  copytrading/listen_wallet_transactions.py
    Was hardcoded to WALLET_TO_TRACK = "...". Now accepts argv[1] so
    you can run it without editing the file.

  pumpswap/get_pumpswap_pools.py
    Same pattern (TOKEN_MINT placeholder) and the underlying
    getProgramAccounts call would also time out at the default 30s
    on busy mainnet RPCs — bumped both AsyncClient timeouts to 120s.

  bonding-curve-progress/get_graduating_tokens.py
    Bumped RPC timeout 120s → 240s for the same reason. The threshold
    scan over all pump.fun bonding curves still occasionally exceeds
    even that on overloaded RPCs (it's a known-heavy query); a smaller
    threshold or memcmp-narrowed filter is the proper long-term fix.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

learning-examples/bonding-curve-progress/get_graduating_tokens.py

@@ -141,7 +141,7 @@ def get_mint_address(data: bytes) -> str:
 
 async def main() -> None:
     """Main entry point for querying and processing bonding curves."""
-    async with AsyncClient(RPC_ENDPOINT, commitment="processed", timeout=120) as client:
+    async with AsyncClient(RPC_ENDPOINT, commitment="processed", timeout=240) as client:
         await client.is_connected()
 
         bonding_curves = await get_bonding_curves_by_reserves(client)