Add changelog for v1.0.2 (#1714)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

CHANGELOG.md

@@ -5,6 +5,62 @@ All notable changes to the Copilot SDK are documented in this file.
 This changelog is automatically generated by an AI agent when stable releases are published.
 See [GitHub Releases](https://github.com/github/copilot-sdk/releases) for the full list.
 
+## [v1.0.2](https://github.com/github/copilot-sdk/releases/tag/v1.0.2) (2026-06-18)
+
+### Feature: opt-in memory for sessions
+
+Sessions can now be configured with persistent memory, allowing the agent to recall information across turns. Set `memory: { enabled: true }` when creating or resuming a session; when omitted the runtime default applies. ([#1617](https://github.com/github/copilot-sdk/pull/1617))
+
+```ts
+const session = await client.createSession({
+    memory: { enabled: true },
+});
+```
+
+```cs
+var session = await client.CreateSessionAsync(new SessionConfig
+{
+    Memory = new MemoryConfiguration { Enabled = true }
+});
+```
+
+### Feature: `defer` parameter for tool definitions
+
+Tools now support a `defer` option controlling whether they are pre-loaded eagerly or surfaced lazily through tool search. Use `"auto"` (the default) to allow lazy loading, or `"never"` to force pre-loading. ([#1632](https://github.com/github/copilot-sdk/pull/1632))
+
+```ts
+defineTool("lookup_issue", {
+    description: "Fetch issue details",
+    parameters: z.object({ id: z.string() }),
+    defer: "auto",
+    handler: async ({ id }) => { /* ... */ },
+});
+```
+
+```cs
+var tool = CopilotTool.DefineTool(
+    async ([Description("Issue ID")] string id) => { /* ... */ },
+    toolOptions: new CopilotToolOptions { Defer = CopilotToolDefer.Auto });
+```
+
+### Other changes
+
+- feature: **[All SDKs]** add `otlpProtocol` telemetry option (`"http/json"` or `"http/protobuf"`) for configuring OTLP export transport ([#1648](https://github.com/github/copilot-sdk/pull/1648))
+- feature: **[All SDKs]** surface `ModelBilling.tokenPrices` on public SDK types, exposing per-tier input/output/cache pricing and context window limits ([#1633](https://github.com/github/copilot-sdk/pull/1633))
+- improvement: **[All SDKs]** call `runtime.shutdown` during normal client stop for deterministic OTEL telemetry flush before process cleanup ([#1667](https://github.com/github/copilot-sdk/pull/1667))
+- improvement: **[Go]** thread `context.Context` through the JSON-RPC request path for proper cancellation support ([#1643](https://github.com/github/copilot-sdk/pull/1643))
+- improvement: **[Java]** add `getOpenCanvases()` to `CopilotSession` to track currently open canvas instances, matching the other SDKs ([#1606](https://github.com/github/copilot-sdk/pull/1606))
+- improvement: **[Java]** rename `SystemPromptSections` to `SystemMessageSections` for cross-SDK consistency; old class deprecated with `forRemoval=true` ([#1683](https://github.com/github/copilot-sdk/pull/1683))
+- bugfix: **[Python]** round sub-millisecond durations in `to_timedelta_int` to avoid serialization errors ([#1668](https://github.com/github/copilot-sdk/pull/1668))
+- bugfix: **[Rust]** skip CLI binary download in `build.rs` when `DOCS_RS` env var is set ([#1660](https://github.com/github/copilot-sdk/pull/1660))
+
+### New contributors
+
+- @andyfeller made their first contribution in [#1631](https://github.com/github/copilot-sdk/pull/1631)
+- @almaleksia made their first contribution in [#1632](https://github.com/github/copilot-sdk/pull/1632)
+- @idryzhov made their first contribution in [#1668](https://github.com/github/copilot-sdk/pull/1668)
+- @scottaddie made their first contribution in [#1636](https://github.com/github/copilot-sdk/pull/1636)
+
 ## [v0.2.2](https://github.com/github/copilot-sdk/releases/tag/v0.2.2) (2026-04-10)
 
 ### Feature: `enableConfigDiscovery` for automatic MCP and skill config loading