docs: rebuild the v2 documentation around a task-based page tree (#2397)

.github/ISSUE_TEMPLATE/v2-feedback.yml

@@ -0,0 +1,53 @@
+name: v2 feedback
+description: Bugs, API friction, or docs gaps in v2 of the SDK
+title: '[v2] '
+labels: ['v2']
+body:
+    - type: markdown
+      attributes:
+          value: |
+              Thanks for trying v2. Anything that broke, surprised you, or slowed you down is useful — API feedback is explicitly welcome while v2 is in beta.
+
+              Docs: https://ts.sdk.modelcontextprotocol.io/v2/ · Migration from v1: https://ts.sdk.modelcontextprotocol.io/v2/migration/
+    - type: textarea
+      id: what
+      attributes:
+          label: What happened?
+          description: What did you do, and what went wrong (or felt wrong)? Paste error output verbatim if there is any.
+      validations:
+          required: true
+    - type: textarea
+      id: expected
+      attributes:
+          label: What did you expect?
+      validations:
+          required: false
+    - type: textarea
+      id: repro
+      attributes:
+          label: Code to reproduce
+          description: The smallest snippet or repository that shows it. For docs feedback, link the page instead.
+          render: TypeScript
+      validations:
+          required: false
+    - type: input
+      id: version
+      attributes:
+          label: SDK version
+          description: The published version (`npm ls @modelcontextprotocol/server @modelcontextprotocol/client`) or commit.
+      validations:
+          required: false
+    - type: dropdown
+      id: area
+      attributes:
+          label: Area
+          options:
+              - Server
+              - Client
+              - Transports
+              - Auth
+              - Documentation
+              - Migration / codemod
+              - Other
+      validations:
+          required: false