fix(core,webapp): coerce numeric concurrencyKey to string #6719

Job	Run time
Detect changes	4s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	3m 56s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 45s
sdk-compat / Node.js 20.20 (ubuntu-latest)	2m 7s
sdk-compat / Bun Runtime	2m 11s
e2e-webapp / 🧪 E2E Tests: Webapp	3m 36s
packages / 🧪 Unit Tests: Packages (1, 1)	11m 46s
internal / 🧪 Unit Tests: Internal (7, 8)	7m 7s
webapp / 🧪 Unit Tests: Webapp (5, 8)	3m 50s
webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 55s
sdk-compat / Deno Runtime	2m 9s
internal / 🧪 Unit Tests: Internal (8, 8)	2m 47s
internal / 🧪 Unit Tests: Internal (1, 8)	7m 21s
internal / 🧪 Unit Tests: Internal (5, 8)	6m 18s
typecheck / typecheck	7m 35s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	3m 47s
sdk-compat / Node.js 22.12 (ubuntu-latest)	1m 58s
webapp / 🧪 Unit Tests: Webapp (8, 8)	7m 16s
webapp / 🧪 Unit Tests: Webapp (1, 8)	7m 13s
internal / 🧪 Unit Tests: Internal (2, 8)	13m 23s
webapp / 🧪 Unit Tests: Webapp (2, 8)	4m 34s
internal / 🧪 Unit Tests: Internal (6, 8)	6m 41s
webapp / 🧪 Unit Tests: Webapp (7, 8)	9m 27s
internal / 🧪 Unit Tests: Internal (3, 8)	9m 1s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 57s
sdk-compat / Cloudflare Workers	2m 27s
webapp / 🧪 Unit Tests: Webapp (6, 8)	5m 49s
internal / 🧪 Unit Tests: Internal (4, 8)	6m 36s
webapp / 🧪 Unit Tests: Webapp (4, 8)	7m 39s
webapp / 📊 Merge Reports	52s
packages / 📊 Merge Reports	28s
internal / 📊 Merge Reports	27s
All PR Checks	3s
	2h 36m 5s

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