feat: initial scaffold + JobStore (v0.1.0)

CHANGELOG.md

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+# Changelog
+
+All notable changes to `platform-common` are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Planned
+- `platform_common.checkpoint.make_checkpointer()` — LangGraph checkpointer factory (Redis + Postgres backends).
+- `platform_common.blob.BlobStore` — Azure Blob wrapper.
+- `platform_common.lease.LeaderLease` — Kubernetes Lease-based singleton coordination.
+
+## [0.1.0] — 2026-06-09
+
+### Added
+- Initial package skeleton with `src/` layout, `py.typed` marker, ruff + mypy + pytest config.
+- `platform_common.jobs.JobStore` — async protocol for TTL-bounded, replica-safe key/value job state.
+- `platform_common.jobs.InMemoryJobStore` — reference / testing backend (LRU + TTL, asyncio-safe).
+- `platform_common.jobs.JobRecord` — typed record shape (`id`, `status`, `payload`, `result`, `error`, `created_at`, `updated_at`).
+- `platform_common.jobs.JobStatus` — `pending` / `running` / `succeeded` / `failed` / `cancelled`.
+- `platform_common.jobs.make_job_store()` — env-driven factory (`JOB_STORE_URL`); defaults to in-memory.
+- Gitea Actions CI: ruff, mypy, pytest on every push; build + publish to Gitea PyPI on tag.
+- Design doc at `docs/jobstore-design.md`.