Can't infer engine by filename/extension

[sgammon]

Issue description

When running elide.debug ./.../hello.js:

➜  framework git:(release/alpha8) ✗ ./packages/cli/build/native/nativeCompile/elide.debug run ./tools/scripts/hello.js
elide 23:17:58.977 WARN  Python/Ruby do not support embedded or hybrid VFS yet; falling back to host I/O
elide 23:17:59.014 DEBUG Hello, JS!
Exiting session. Have a great day! 👋

elide.debug ./.../hello.py:

elide 23:18:19.844 WARN  Python/Ruby do not support embedded or hybrid VFS yet; falling back to host I/O
elide 23:18:19.877 ERROR Uncaught exception within VM context. Please catch and handle all VM execution exceptions. java.lang.NullPointerException
java.lang.NullPointerException
	at elide.tool.control.AbstractScriptEngineFactory.getEngineName(AbstractScriptEngineFactory.kt:36)
	at java.base@22.0.1/java.util.Comparator.lambda$comparing$ea9a8b3a$1(Comparator.java:440)
	at java.base@22.0.1/java.util.TreeMap.put(TreeMap.java:830)
	at java.base@22.0.1/java.util.TreeMap.put(TreeMap.java:569)
	at java.base@22.0.1/java.util.TreeSet.add(TreeSet.java:259)
	at java.scripting@22.0.1/javax.script.ScriptEngineManager.initEngines(ScriptEngineManager.java:106)
	at java.scripting@22.0.1/javax.script.ScriptEngineManager.<init>(ScriptEngineManager.java:76)
	at elide.tool.cli.cmd.repl.ToolShellCommand.scriptEngineManager_delegate$lambda$0(ToolShellCommand.kt:542)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
	at elide.tool.cli.cmd.repl.ToolShellCommand.getScriptEngineManager(ToolShellCommand.kt:541)
	at elide.tool.cli.cmd.repl.ToolShellCommand.primaryFromFile(ToolShellCommand.kt:1447)
	at elide.tool.cli.cmd.repl.ToolShellCommand.resolvePrimaryLanguage-mGOj7VY(ToolShellCommand.kt:1465)
	at elide.tool.cli.cmd.repl.ToolShellCommand.invoke$lambda$43(ToolShellCommand.kt:1622)
	at elide.tool.cli.cmd.repl.ToolShellCommand.invoke$lambda$50(ToolShellCommand.kt:1693)
	at elide.tool.cli.AbstractSubcommand.withContext(AbstractSubcommand.kt:543)
	at elide.tool.cli.cmd.repl.ToolShellCommand.invoke(ToolShellCommand.kt:1641)
	at elide.tool.cli.cmd.repl.ToolShellCommand$invoke$1.invokeSuspend(ToolShellCommand.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
	at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:277)
	at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:95)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:69)
	at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:48)
	at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
	at elide.tool.cli.AbstractToolCommand.execute(AbstractToolCommand.kt:129)
	at elide.tool.cli.AbstractToolCommand.call(AbstractToolCommand.kt:153)
	at elide.tool.cli.AbstractToolCommand.run(AbstractToolCommand.kt:164)
	at picocli.CommandLine.executeUserObject(CommandLine.java:2026)
	at picocli.CommandLine.access$1500(CommandLine.java:148)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2461)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2453)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2415)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2273)
	at picocli.CommandLine$RunLast.execute(CommandLine.java:2417)
	at picocli.CommandLine.execute(CommandLine.java:2170)
	at elide.tool.cli.ElideTool$Companion.exec$cli(ElideTool.kt:168)
	at elide.tool.cli.ElideTool$Companion.main$lambda$3(ElideTool.kt:138)
	at elide.tool.cli.ElideTool$Companion.installStatics$lambda$2(ElideTool.kt:123)
	at elide.tool.cli.ElideTool$Companion.installStatics(ElideTool.kt:131)
	at elide.tool.cli.ElideTool$Companion.main(ElideTool.kt:137)
	at elide.tool.cli.ElideTool.main(ElideTool.kt)
elide 23:18:19.877 ERROR Exiting with code -1 due to uncaught java.lang.NullPointerException
Exiting session. Have a great day! 👋

elide.debug ./.../hello.rb:

elide 23:19:29.850 WARN  Python/Ruby do not support embedded or hybrid VFS yet; falling back to host I/O
elide 23:19:29.887 ERROR Uncaught exception within VM context. Please catch and handle all VM execution exceptions. java.lang.NullPointerException
java.lang.NullPointerException
	at elide.tool.control.AbstractScriptEngineFactory.getEngineName(AbstractScriptEngineFactory.kt:36)
	at java.base@22.0.1/java.util.Comparator.lambda$comparing$ea9a8b3a$1(Comparator.java:440)
	at java.base@22.0.1/java.util.TreeMap.put(TreeMap.java:830)
	at java.base@22.0.1/java.util.TreeMap.put(TreeMap.java:569)
	at java.base@22.0.1/java.util.TreeSet.add(TreeSet.java:259)
	at java.scripting@22.0.1/javax.script.ScriptEngineManager.initEngines(ScriptEngineManager.java:106)
	at java.scripting@22.0.1/javax.script.ScriptEngineManager.<init>(ScriptEngineManager.java:76)
	at elide.tool.cli.cmd.repl.ToolShellCommand.scriptEngineManager_delegate$lambda$0(ToolShellCommand.kt:542)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
	at elide.tool.cli.cmd.repl.ToolShellCommand.getScriptEngineManager(ToolShellCommand.kt:541)
	at elide.tool.cli.cmd.repl.ToolShellCommand.primaryFromFile(ToolShellCommand.kt:1447)
	at elide.tool.cli.cmd.repl.ToolShellCommand.resolvePrimaryLanguage-mGOj7VY(ToolShellCommand.kt:1465)
	at elide.tool.cli.cmd.repl.ToolShellCommand.invoke$lambda$43(ToolShellCommand.kt:1622)
	at elide.tool.cli.cmd.repl.ToolShellCommand.invoke$lambda$50(ToolShellCommand.kt:1693)
	at elide.tool.cli.AbstractSubcommand.withContext(AbstractSubcommand.kt:543)
	at elide.tool.cli.cmd.repl.ToolShellCommand.invoke(ToolShellCommand.kt:1641)
	at elide.tool.cli.cmd.repl.ToolShellCommand$invoke$1.invokeSuspend(ToolShellCommand.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
	at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:277)
	at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:95)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:69)
	at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:48)
	at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
	at elide.tool.cli.AbstractToolCommand.execute(AbstractToolCommand.kt:129)
	at elide.tool.cli.AbstractToolCommand.call(AbstractToolCommand.kt:153)
	at elide.tool.cli.AbstractToolCommand.run(AbstractToolCommand.kt:164)
	at picocli.CommandLine.executeUserObject(CommandLine.java:2026)
	at picocli.CommandLine.access$1500(CommandLine.java:148)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2461)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2453)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2415)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2273)
	at picocli.CommandLine$RunLast.execute(CommandLine.java:2417)
	at picocli.CommandLine.execute(CommandLine.java:2170)
	at elide.tool.cli.ElideTool$Companion.exec$cli(ElideTool.kt:168)
	at elide.tool.cli.ElideTool$Companion.main$lambda$3(ElideTool.kt:138)
	at elide.tool.cli.ElideTool$Companion.installStatics$lambda$2(ElideTool.kt:123)
	at elide.tool.cli.ElideTool$Companion.installStatics(ElideTool.kt:131)
	at elide.tool.cli.ElideTool$Companion.main(ElideTool.kt:137)
	at elide.tool.cli.ElideTool.main(ElideTool.kt)
elide 23:19:29.888 ERROR Exiting with code -1 due to uncaught java.lang.NullPointerException
Exiting session. Have a great day! 👋

Meanwhile, via:

➜  framework git:(release/alpha8) ✗ ./packages/cli/build/native/nativeCompile/elide.debug run --language=PYTHON ./tools/scripts/hello.py
elide 23:20:10.403 WARN  Python/Ruby do not support embedded or hybrid VFS yet; falling back to host I/O
elide 23:20:10.525 WARN  Caution: Support for Python considered experimental.
Hello, Python!
Exiting session. Have a great day! 👋

And Ruby:

➜  framework git:(release/alpha8) ✗ ./packages/cli/build/native/nativeCompile/elide.debug run --language=RUBY ./tools/scripts/hello.rb
elide 23:20:38.928 WARN  Python/Ruby do not support embedded or hybrid VFS yet; falling back to host I/O
elide 23:20:39.043 WARN  Caution: Support for Ruby considered experimental.
Hello, Ruby!
Exiting session. Have a great day! 👋