chore: add LICENSE, CONTRIBUTING, issue templates

Author: byteworthy

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug report
+description: Report a bug in upstream-community
+labels: ["bug"]
+body:
+  - type: input
+    id: module
+    attributes:
+      label: Which module?
+      placeholder: e.g. denial_clustering.py
+    validations:
+      required: true
+  - type: input
+    id: python
+    attributes:
+      label: Python version
+    validations:
+      required: true
+  - type: textarea
+    id: code
+    attributes:
+      label: Minimal reproduction
+      render: python
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior or error
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature request
+description: Suggest a new module, technique, or notebook
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: What methodology question does this address?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed approach
+    validations:
+      required: true
+  - type: textarea
+    id: references
+    attributes:
+      label: References or prior art

LICENSE

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+MIT License
+
+Copyright (c) 2026 Upstream Intelligence
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.