chore(rivetkit): log inspector errors + standardize pino errorKey error

[abcxff]

Adds error logs to inpector requests + standardizes error errorKey for pino (was being used but not configured in base logger)

[railway-app]

🚅 Deployed to the rivet-pr-4986 environment in rivet-frontend

Service	Status	Web	Updated (UTC)
kitchen-sink	❌ Build Failed (View Logs)	Web	May 7, 2026 at 8:19 pm
website	😴 Sleeping (View Logs)	Web	May 7, 2026 at 5:48 am
frontend-inspector	❌ Build Failed (View Logs)	Web	May 6, 2026 at 7:43 pm
ladle	❌ Build Failed (View Logs)	Web	May 6, 2026 at 7:42 pm
frontend-cloud	❌ Build Failed (View Logs)	Web	May 6, 2026 at 7:41 pm
mcp-hub	✅ Success (View Logs)	Web	May 6, 2026 at 7:41 pm

[abcxff]

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• fix(pegboard): validate drain_grace_period < request_lifespan #4998
• fix(rivetkit): bind methods through createWriteThroughProxy #4987
• chore(rivetkit): log inspector errors + standardize pino errorKey error #4986 👈 (View in Graphite)
• [slop]fix(rivetkit): remove async drizzle db proxy #4984 : 2 other dependent PRs (#4985 , #4991 )
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[claude]

PR Review: fix: log error on failed inspector requests\n\n### Overview\n\nThis PR does two things:\n1. Core fix: Adds errorKey: "error" to pino logger configuration and adds explicit error logging before returning errorResponse(error) in three inspector endpoints in native.ts that previously swallowed errors silently.\n2. Cleanup: Renames the log field key from err to error across multiple files for consistency with the new pino errorKey setting.\n\nThe inspector error logging is a genuine fix. The field renaming is a reasonable consistency sweep.\n\n---\n\n### Issues\n\nBug: Variable shadowing in inline-websocket-adapter.ts\n\nIn #handleError(error: unknown), the inner catch was renamed from catch (handlerErr) to catch (error), shadowing the outer error parameter. Functionally the triggerError calls still reference the outer error (the catch block ends before them), but this will mislead future readers. The original catch (handlerErr) was clearer. Rename to catch (handlerError) to avoid the shadow.\n\nStyle: Uppercase log messages in native.ts\n\nTwo of the three new log messages start with uppercase, violating the CLAUDE.md convention: "Log messages should be lowercase unless mentioning specific code symbols."\n\n- "Error handling inspector action request" should be "error handling inspector action request"\n- "Error handling inspector request" should be "error handling inspector request"\n\nThe third new message ("error replaying workflow history") is already correct.\n\nChanges to deprecated runner paths\n\nengine/sdks/typescript/runner/src/mod.ts and rivetkit-typescript/packages/engine-runner/src/mod.ts are in the deprecated runner path. CLAUDE.md says: "Do not add features to or fix bugs in the deprecated runner path." These are low-risk renames but can be omitted since the files are on the way out.\n\n---\n\n### Minor observations\n\n- The errorKey: "error" pino config change is the right approach — it activates pino's built-in Error serializer (captures message, stack, type) for fields passed under the error key.\n- Several places in actor-driver.ts pass stringifyError(err) (a string) as the error field. This is pre-existing, but now that pino's serializer is wired to that key, passing the raw Error object would let pino extract stack and type automatically.\n- The change at actor-driver.ts:1982 renames the field key to error: err but leaves the variable as err. Consider renaming the variable too for full consistency.\n- PR description is empty and checklist unchecked. A brief summary would help reviewers and future git bisect.\n\n---\n\n### Summary\n\nThe core inspector error logging fix is correct and needed. Before merging: rename the shadowing catch (error) to catch (handlerError) in inline-websocket-adapter.ts, and lowercase the two uppercase log messages in native.ts.