Add speech transcribe intent

[kvz]

Summary

• add transloadit speech transcribe as a semantic intent
• default the intent to text output and provider: replicate while ElevenLabs is pending
• keep the WIP provider: transloadit out of the intent provider surface
• regenerate intent docs and README command reference

Tests

• ./node_modules/.bin/vitest run packages/node/test/unit/cli/intents.test.ts packages/node/test/unit/cli/intent-docs.test.ts
• ./node_modules/.bin/biome check packages/node/src/cli/semanticIntents/speechTranscribe.ts packages/node/src/cli/semanticIntents/index.ts packages/node/src/cli/intentCommandSpecs.ts packages/node/test/support/intentSmokeCases.ts packages/node/test/unit/cli/intents.test.ts packages/node/README.md packages/node/docs/intent-commands.md

Notes

• yarn tsc:node currently fails on existing packages/node/src/inputFiles.ts type incompatibility around lookup; this branch does not touch that file.