Prepare v2.0.0 official release

.github/ISSUE_TEMPLATE/01-bug-report.yml

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+name: Bug report
+description: Report a reproducible problem in RMC-BestFit
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reporting a problem. Please include enough detail for maintainers to reproduce it.
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: What happened, and what did you expect instead?
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Include inputs, options, distributions, estimation methods, and a minimal dataset when possible.
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: RMC-BestFit version, .NET SDK version, operating system, and whether you used the library, API, or desktop app.
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs or screenshots
+      description: Paste relevant exception messages, output, screenshots, or stack traces.
+      render: text

.github/ISSUE_TEMPLATE/02-feature-request.yml

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+name: Feature request
+description: Suggest an improvement or new capability
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or use case
+      description: What engineering, analysis, or developer workflow would this help?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed behavior
+      description: Describe the feature you would like to see.
+    validations:
+      required: true
+  - type: textarea
+    id: references
+    attributes:
+      label: References
+      description: Link guidance documents, journal articles, validation data, or comparable software behavior if relevant.
+  - type: dropdown
+    id: area
+    attributes:
+      label: Area
+      options:
+        - Model library
+        - API
+        - Desktop application
+        - Documentation
+        - Validation
+        - Other
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/03-documentation.yml

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+name: Documentation issue
+description: Report missing, unclear, or incorrect documentation
+title: "[Docs]: "
+labels: ["documentation"]
+body:
+  - type: textarea
+    id: location
+    attributes:
+      label: Documentation location
+      description: Link or name the README, docs page, example, XML docs, or API area.
+    validations:
+      required: true
+  - type: textarea
+    id: issue
+    attributes:
+      label: Issue
+      description: What is missing, unclear, incorrect, or outdated?
+    validations:
+      required: true
+  - type: textarea
+    id: suggestion
+    attributes:
+      label: Suggested improvement
+      description: Optional wording, examples, equations, or references that would help.

.github/ISSUE_TEMPLATE/04-question.yml

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+name: Question
+description: Ask a usage, modeling, or development question
+title: "[Question]: "
+labels: ["question"]
+body:
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+      description: What would you like to understand?
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: Include the analysis type, data type, code snippet, or documentation link if relevant.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+<!-- Briefly describe what this PR changes and why. -->
+
+## Related Issue
+
+<!-- Link the issue discussed before this PR. PRs without prior discussion may be closed. -->
+
+Fixes #
+
+## Changes
+
+-
+-
+
+## Test Plan
+
+- [ ] Model-library tests pass locally (`dotnet test src/RMC.BestFit.Tests/RMC.BestFit.Tests.csproj -c Release`)
+- [ ] New or changed public behavior has unit tests
+- [ ] Documentation or examples were updated when behavior changed
+- [ ] No new build warnings introduced
+
+## Checklist
+
+- [ ] Public types and members have XML documentation
+- [ ] Changes are focused and do not include unrelated formatting churn
+- [ ] I have read [CONTRIBUTING.md](../CONTRIBUTING.md)
+- [ ] I agree to the Developer Certificate of Origin (DCO)

.github/release.yml

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+changelog:
+  categories:
+    - title: Features
+      labels:
+        - enhancement
+    - title: Bug fixes
+      labels:
+        - bug
+    - title: Documentation
+      labels:
+        - documentation
+    - title: Other changes
+      labels:
+        - "*"

.github/workflows/Integration.yml

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+name: Integration
+
+on:
+  pull_request:
+    branches: [ main ]
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  model-library:
+    name: Model library
+    runs-on: windows-latest
+    timeout-minutes: 60
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET SDK
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Restore
+        run: dotnet restore src/RMC.BestFit.Tests/RMC.BestFit.Tests.csproj
+
+      - name: Build
+        run: dotnet build src/RMC.BestFit.Tests/RMC.BestFit.Tests.csproj -c Release --no-restore /p:Version=2.0.0
+
+      - name: Test
+        env:
+          VSTEST_CONNECTION_TIMEOUT: '600'
+        run: dotnet test src/RMC.BestFit.Tests/RMC.BestFit.Tests.csproj -c Release --no-build

.github/workflows/NuGetPublish.yml

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+name: Publish to NuGet.org
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+  id-token: write
+
+jobs:
+  publish:
+    runs-on: windows-latest
+    timeout-minutes: 60
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup .NET SDK
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Extract and validate version
+        shell: pwsh
+        run: |
+          $version = $env:GITHUB_REF_NAME -replace '^v', ''
+          if ($version -ne '2.0.0') {
+            throw "The first public NuGet publish is restricted to v2.0.0; got '$env:GITHUB_REF_NAME'."
+          }
+          "VERSION=$version" >> $env:GITHUB_ENV
+
+      - name: Restore
+        run: dotnet restore src/RMC.BestFit/RMC.BestFit.csproj
+
+      - name: Build
+        shell: pwsh
+        run: dotnet build src/RMC.BestFit/RMC.BestFit.csproj -c Release --no-restore /p:Version=$env:VERSION
+
+      - name: Pack
+        shell: pwsh
+        run: dotnet pack src/RMC.BestFit/RMC.BestFit.csproj -c Release --no-build --no-restore -o packages /p:Version=$env:VERSION
+
+      - name: NuGet login
+        uses: NuGet/login@v1
+        id: login
+        with:
+          user: USACE-RMC
+
+      - name: Push to NuGet.org
+        shell: pwsh
+        env:
+          NUGET_API_KEY: ${{ steps.login.outputs.NUGET_API_KEY }}
+        run: |
+          $packagePath = "packages/RMC.BestFit.$env:VERSION.nupkg"
+          if (-not (Test-Path $packagePath)) {
+            throw "Missing package: $packagePath"
+          }
+          dotnet nuget push $packagePath --api-key $env:NUGET_API_KEY --source "https://api.nuget.org/v3/index.json" --skip-duplicate