docs: fix six broken hook anchor links (#2519)

session-lifecycle.md was the only file in docs/ using the explicit heading-id extension (## Heading {#id}). GitHub's Markdown does not implement it, so the braces render as literal text in the heading and the six links that target those ids resolve to nothing.

Drop the explicit ids and point the links at the generated slugs, matching the other 50 files in docs/.

Co-authored-by: Zhangyi Yuan <j-zhangyiyuan@microsoft.com>

Author: rinceyuan

docs/features/hooks.md

@@ -22,13 +22,13 @@ flowchart LR
 
 | Hook                                                                | When it fires                       | What you can do                            |
 | ------------------------------------------------------------------- | ----------------------------------- | ------------------------------------------ |
-| [`onSessionStart`](../hooks/session-lifecycle.md#session-start)     | Session begins (new or resumed)     | Inject context, load preferences           |
+| [`onSessionStart`](../hooks/session-lifecycle.md#session-start-hook)     | Session begins (new or resumed)     | Inject context, load preferences           |
 | [`onUserPromptSubmitted`](../hooks/user-prompt-submitted.md)        | User sends a message                | Rewrite prompts, add context, filter input |
 | [`onUserPromptTransformed`](../hooks/user-prompt-transformed.md)    | Runtime builds the model prompt     | Inspect or replace model-facing content    |
 | [`onPreToolUse`](../hooks/pre-tool-use.md)                          | Before a tool executes              | Allow / deny / modify the call             |
 | [`onPostToolUse`](../hooks/post-tool-use.md)                        | After a tool returns (success only) | Transform results, redact secrets, audit   |
 | [`onPostToolUseFailure`](../hooks/post-tool-use.md#failure-variant) | After a tool returns a failure      | Inject retry guidance, log failures        |
-| [`onSessionEnd`](../hooks/session-lifecycle.md#session-end)         | Session ends                        | Clean up, record metrics                   |
+| [`onSessionEnd`](../hooks/session-lifecycle.md#session-end-hook)         | Session ends                        | Clean up, record metrics                   |
 | [`onErrorOccurred`](../hooks/error-handling.md)                     | An error is raised                  | Custom logging, retry logic, alerts        |
 
 All hooks are **optional**—register only the ones you need. Returning `null` (or the language equivalent) from any hook tells the SDK to continue with default behavior.

docs/hooks/hooks-overview.md

@@ -17,10 +17,10 @@ Hooks allow you to intercept and customize the behavior of Copilot sessions at k
 | [`onPostToolUseFailure`](./post-tool-use.md#failure-variant) | After a tool execution whose result was a failure | Inject retry guidance, log failures |
 | [`onUserPromptSubmitted`](./user-prompt-submitted.md) | When user sends a message | Prompt modification, filtering |
 | [`onUserPromptTransformed`](./user-prompt-transformed.md) | After runtime prompt transformation | Inspect or replace model-facing content |
-| [`onSessionStart`](./session-lifecycle.md#session-start) | Session begins | Add context, configure session |
-| [`onSessionEnd`](./session-lifecycle.md#session-end) | Session ends | Cleanup, analytics |
+| [`onSessionStart`](./session-lifecycle.md#session-start-hook) | Session begins | Add context, configure session |
+| [`onSessionEnd`](./session-lifecycle.md#session-end-hook) | Session ends | Cleanup, analytics |
 | [`onErrorOccurred`](./error-handling.md) | Error happens | Custom error handling |
-| [`onAgentStop`](./session-lifecycle.md#agent-stop) | Top-level agent naturally stops | Validate completion or request another turn |
+| [`onAgentStop`](./session-lifecycle.md#agent-stop-hook) | Top-level agent naturally stops | Validate completion or request another turn |
 
 ## Quick start
 
@@ -266,7 +266,7 @@ const session = await client.createSession({
 * **[User Prompt Submitted Hook](./user-prompt-submitted.md)** - Modify user prompts
 * **[User Prompt Transformed Hook](./user-prompt-transformed.md)** - Replace model-facing prompts
 * **[Session Lifecycle Hooks](./session-lifecycle.md)** - Session start and end
-* **[Agent Stop Hook](./session-lifecycle.md#agent-stop)** - Validate completion before the agent stops
+* **[Agent Stop Hook](./session-lifecycle.md#agent-stop-hook)** - Validate completion before the agent stops
 * **[Error Handling Hook](./error-handling.md)** - Custom error handling
 
 ## See also

docs/hooks/session-lifecycle.md

@@ -7,7 +7,7 @@ Session lifecycle hooks let you respond to session start and end events. Use the
 * Track session metrics and analytics
 * Configure session behavior dynamically
 
-## Session start hook {#session-start}
+## Session start hook
 
 The `onSessionStart` hook is called when a session begins (new or resumed).
 
@@ -250,7 +250,7 @@ const session = await client.createSession({
 });
 ```
 
-## Session end hook {#session-end}
+## Session end hook
 
 The `onSessionEnd` hook is called when a session ends.
 
@@ -540,7 +540,7 @@ Session Summary:
 });
 ```
 
-## Agent stop hook {#agent-stop}
+## Agent stop hook
 
 The agent stop hook runs when the top-level agent naturally reaches the end of a turn. It is separate from `onSessionEnd`: the session remains active, and the hook can request another agent turn.