docs: add Issue Form templates for the Tabularis migration flow

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a problem with the PostgreSQL plugin.
+title: "Bug: "
+labels: ["bug"]
+body:
+  - type: input
+    id: plugin_version
+    attributes:
+      label: Plugin version
+    validations:
+      required: true
+  - type: input
+    id: app_version
+    attributes:
+      label: Tabularis app version
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      placeholder: e.g. macOS 15.1, Windows 11, Ubuntu 24.04
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+      description: What did you expect, and what happened instead?
+    validations:
+      required: true
+  - type: textarea
+    id: repro_steps
+    attributes:
+      label: Steps to reproduce
+    validations:
+      required: false
+  - type: textarea
+    id: error
+    attributes:
+      label: Error message, if any
+      render: text
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/capability-gap.yml

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+name: Feature parity gap
+description: >-
+  Filed automatically by Tabularis when a connection uses a builtin-only
+  feature this plugin doesn't yet support.
+title: "Feature parity gap: "
+labels: ["capability-gap"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        This form was pre-filled by Tabularis's builtin-to-plugin migration
+        flow, from a connection that uses a feature the plugin's declared
+        capabilities don't yet cover. Review before submitting — nothing has
+        been sent yet. No credentials or connection strings are included.
+  - type: input
+    id: feature
+    attributes:
+      label: Missing feature
+      placeholder: e.g. SSH tunneling, IAM auth, Kubernetes port-forwarding
+    validations:
+      required: true
+  - type: input
+    id: plugin_version
+    attributes:
+      label: Plugin version
+    validations:
+      required: true
+  - type: input
+    id: app_version
+    attributes:
+      label: Tabularis app version
+    validations:
+      required: true
+  - type: textarea
+    id: additional_context
+    attributes:
+      label: Additional context
+      description: Anything else that might help scope or reproduce this.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/migration-failure.yml

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+name: Migration from builtin failed
+description: >-
+  Filed automatically by Tabularis when switching a connection from the
+  builtin postgres driver to this plugin fails.
+title: "Migration failed: "
+labels: ["migration"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        This form was pre-filled by Tabularis's builtin-to-plugin migration
+        flow. Review the details below before submitting — nothing has been
+        sent yet. No credentials or connection strings are included.
+  - type: dropdown
+    id: failure_mode
+    attributes:
+      label: Failure mode
+      description: >-
+        "Process" means the plugin itself never started (interpreter
+        missing, crash). "Connection" means the plugin started fine but
+        the specific database connection failed.
+      options:
+        - connection
+        - process
+    validations:
+      required: true
+  - type: input
+    id: plugin_version
+    attributes:
+      label: Plugin version
+    validations:
+      required: true
+  - type: input
+    id: app_version
+    attributes:
+      label: Tabularis app version
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      placeholder: e.g. macOS 15.1, Windows 11, Ubuntu 24.04
+    validations:
+      required: true
+  - type: input
+    id: migrated_from_driver
+    attributes:
+      label: Migrated from
+      placeholder: e.g. builtin postgres
+    validations:
+      required: false
+  - type: textarea
+    id: error
+    attributes:
+      label: Error message
+      description: The exact error returned when the migration or connection failed.
+      render: text
+    validations:
+      required: true
+  - type: textarea
+    id: additional_context
+    attributes:
+      label: Additional context
+      description: Anything else that might help reproduce or diagnose this.
+    validations:
+      required: false