Add defaults to calculations for ToolIO (#7289)

# Description of Changes
Currently when calculating the output file type for some tools, the
system will get it wrong because it doesn't know about what the default
parameters in tools are, so if it doesn't have a value for some key,
it'll just bail out and say "it might not be compatible". This PR adds
logic to `ToolIO` to read the default values set for the parameters if
the tool has `ToolIOCase`s and takes them into account when figuring out
the output type. I've built it with horrible Java reflection magic to
avoid having to specify the default for params twice, which will make it
impossible for the defaults to disagree with each other. This just runs
once at startup so there's negligible performance impact.

The change is easily tested with Change Parameters, which is just
`add-password` behind the scenes but with the password params omitted
(so Change Password is always PDF->PDF, never encrypted like Add
Password).

Also (somewhat hackily) fixes a bug I noticed where saving a Change
Permissions step then leaving and returning to the pipeline will cause
the step to be reloaded as Add Password. I've added a system to
disambiguate tools which share the same endpoint (which is only these
two currently).

## Currently

<img width="455" height="135" alt="image"
src="https://github.com/user-attachments/assets/c8867d6a-599b-4f21-a2db-4a1b6ac22d73"
/>

## Now

<img width="415" height="122" alt="image"
src="https://github.com/user-attachments/assets/bd8d1bab-f00a-421b-8c91-5af0d2ad5335"
/>

testing/tool-io-cases.json

@@ -70,6 +70,33 @@
           "arity": "SISO"
         }
       ]
+    },
+    "autoRotateShape": {
+      "accepts": ["PDF"],
+      "produces": "PDF",
+      "arity": "SISO",
+      "cases": [
+        {
+          "when": [{ "param": "dryRun", "matches": ["true"], "default": "false" }],
+          "produces": "JSON",
+          "arity": "SISO"
+        }
+      ]
+    },
+    "changePermsShape": {
+      "accepts": ["PDF"],
+      "produces": "PDF_ENCRYPTED",
+      "arity": "SISO",
+      "cases": [
+        {
+          "when": [
+            { "param": "password", "matches": [""], "default": "" },
+            { "param": "ownerPassword", "matches": [""], "default": "" }
+          ],
+          "produces": "PDF",
+          "arity": "SISO"
+        }
+      ]
     }
   },
   "cases": [
@@ -250,6 +277,35 @@
       ],
       "expected": [{ "stepIndex": 1, "severity": "INFO", "code": "fan-in" }]
     },
+    {
+      "name": "an absent parameter takes its default, which here does not trigger the case",
+      "steps": [{ "spec": "autoRotateShape" }, { "spec": "pdfToPdf" }],
+      "expected": []
+    },
+    {
+      "name": "an explicit value overrides the default and triggers the case",
+      "steps": [
+        { "spec": "autoRotateShape", "parameters": { "dryRun": "true" } },
+        { "spec": "pdfToPdf" }
+      ],
+      "expected": [{ "stepIndex": 1, "severity": "ERROR", "code": "format-mismatch" }]
+    },
+    {
+      "name": "an absent parameter whose default triggers the case resolves to that branch",
+      "steps": [{ "spec": "changePermsShape" }, { "spec": "pdfToPdf" }],
+      "expected": []
+    },
+    {
+      "name": "setting the branch parameter away from its default flips the outcome",
+      "steps": [
+        {
+          "spec": "changePermsShape",
+          "parameters": { "password": "hunter2", "ownerPassword": "hunter2" }
+        },
+        { "spec": "pdfToPdf" }
+      ],
+      "expected": [{ "stepIndex": 1, "severity": "ERROR", "code": "format-mismatch" }]
+    },
     {
       "name": "an undeclared step warns and stops the chain being checked past it",
       "steps": [{ "spec": "addPassword" }, { "spec": null }, { "spec": "pdfToPdf" }],