fix(mistral): align MistralParseV3Block on the tool's file parameter

`check-block-registry.ts` requires every required `user-only` tool parameter to
have a subBlock whose `id` or `canonicalParamId` matches it, because the
serializer resolves those by direct lookup and a mismatch false-flags the field
as missing at submit time. V3's subBlocks carried `canonicalParamId: 'document'`
against a tool parameter named `file`, bridged by the block's params mapper.

Aligning them needs no migration. Saved state is keyed by subBlock id
(`fileUpload`, `fileReference`), which is unchanged; `canonicalParamId` is a
config-derived index rather than a storage key. `data.canonicalModes` is keyed
by canonical id, but `backfillCanonicalModes` re-derives a missing entry from
whichever value is populated, so a workflow using the advanced file-reference
field still resolves to `advanced` on open.

V2 keeps `document`: only V3's `file` parameter is `required`, so only V3 is
under the contract.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: icecrasher321

apps/sim/blocks/blocks/mistral_parse.ts

@@ -330,7 +330,7 @@ export const MistralParseV3Block: BlockConfig<MistralParserOutput> = {
       id: 'fileUpload',
       title: 'PDF Document',
       type: 'file-upload' as SubBlockType,
-      canonicalParamId: 'document',
+      canonicalParamId: 'file',
       acceptedTypes: 'application/pdf',
       placeholder: 'Upload a PDF document',
       mode: 'basic',
@@ -341,7 +341,7 @@ export const MistralParseV3Block: BlockConfig<MistralParserOutput> = {
       id: 'fileReference',
       title: 'File Reference',
       type: 'short-input' as SubBlockType,
-      canonicalParamId: 'document',
+      canonicalParamId: 'file',
       placeholder: 'File reference from previous block',
       mode: 'advanced',
       required: true,
@@ -386,7 +386,7 @@ export const MistralParseV3Block: BlockConfig<MistralParserOutput> = {
         }
 
         // V3 pattern: use canonical document param directly
-        const documentInput = normalizeFileInput(params.document, { single: true })
+        const documentInput = normalizeFileInput(params.file, { single: true })
         if (!documentInput) {
           throw new Error('PDF document is required')
         }
@@ -425,7 +425,7 @@ export const MistralParseV3Block: BlockConfig<MistralParserOutput> = {
     },
   },
   inputs: {
-    document: { type: 'json', description: 'Document input (file upload or file reference)' },
+    file: { type: 'json', description: 'Document input (file upload or file reference)' },
     apiKey: { type: 'string', description: 'Mistral API key' },
     resultType: { type: 'string', description: 'Output format type' },
     pages: { type: 'string', description: 'Page selection' },

scripts/check-tool-param-reachability.ts

@@ -35,6 +35,14 @@
  *     merge validation still sees a value — and a direct caller sends the object
  *     itself.
  *
+ * Choosing `user-only` carries an obligation: `check-block-registry.ts` requires
+ * every required `user-only` parameter to have a subBlock whose `id` or
+ * `canonicalParamId` equals the parameter id, because the serializer resolves it
+ * by direct lookup. A block whose canonical key differs has to be aligned on the
+ * parameter id — safe to do, because canonical ids are config-derived rather
+ * than stored, and `backfillCanonicalModes` re-derives a renamed pair's mode
+ * from whichever value is populated.
+ *
  * There is deliberately no allowlist. All three answers leave the parameter
  * reachable, so a parameter needing an exemption is one no caller can supply —
  * exactly what this audit exists to reject.