v0.12.3: measured region, shutdown paths, and bind failures

measured region, shutdown paths, and bind failures

• Telemetry records a post-handler failure — output-schema validation, format(), the enrichment merge, the trailer render — as a failed call, not a successful one (#346)
• Stdin EOF runs the shutdown a signal runs, then exits explicitly, so the OTel export leaves the process (#322)
• Logger.close() bounds each pino flush, so a callback that never arrives no longer hangs shutdown (#342)
• An async HTTP bind failure reaches the retry ladder instead of crashing after a success log (#315)
• api-telemetry 1.7 and api-config 1.13 document the new behavior; package.json description synced to the README tagline
• deps: Bun base-image and packageManager pins 1.3.14 → 1.4.0 (#361)

CHANGELOG v0.12.3