Improve Extensibility

.github/CODEOWNERS

@@ -4,7 +4,4 @@
 # These owners will be the default owners for everything in the repo. Unless a
 # later match takes precedence, these users will be requested for review when
 # someone opens a pull request.
-* @scottoffen @sdoffen
-
-# Recommendation: Use groups to define code owners, e.g.
-# * @organization/team-name
+* @scottoffen @sdoffen

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,104 @@
+name: 🐛 Bug report
+description: Something reproducible that is broken and should be fixed.
+labels: ["bug", "needs-triage"]
+assignees: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for helping make FluentHttpClient better!  
+        **Usage/how-to questions will be closed.** Please use Discussions or StackOverflow instead.
+
+  - type: checkboxes
+    id: preflight
+    attributes:
+      label: Before you submit
+      description: Please confirm the following.
+      options:
+        - label: I have searched existing Issues and Discussions.
+          required: true
+        - label: This is **not** a usage/how-to question.
+          required: true
+        - label: I have read the [contribution guidelines](https://github.com/scottoffen/fluenthttpclient/blob/main/CONTRIBUTING.md).
+          required: true
+
+  - type: input
+    id: fluenthttpclient-version
+    attributes:
+      label: FluentHttpClient Version
+      placeholder: e.g., 0.4.2 or commit SHA
+    validations:
+      required: true
+
+  - type: input
+    id: dotnet-version
+    attributes:
+      label: .NET SDK/Runtime Version
+      placeholder: e.g., .NET 8.0 or SDK 8.0.400
+    validations:
+      required: true
+
+  - type: input
+    id: os
+    attributes:
+      label: OS and Version
+      placeholder: e.g., Windows 11 24H2 / Ubuntu 24.04 / macOS 14.6
+    validations:
+      required: true
+
+  - type: textarea
+    id: other-stack
+    attributes:
+      label: Related Tooling / Libraries (optional)
+      description: If relevant, include DI container, logging framework, IDE, reverse proxy, etc.
+      placeholder: e.g., Microsoft.Extensions.DependencyInjection 8.0.0, Serilog 3.1, Rider 2024.2
+
+  - type: textarea
+    id: repro
+    attributes:
+      label: Minimal Reproducible Example
+      description: Provide the **smallest possible** code/config to reproduce. Link to a repo or include inline code.
+      render: csharp
+      placeholder: |
+        // minimal Program.cs or test demonstrating the issue
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      placeholder: What should happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      placeholder: What actually happens?
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant Logs/Stack Traces (optional)
+      description: Redact secrets. Use backticks for code fences.
+      render: text
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots / Recordings (optional)

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,14 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 📘 FluentHttpClient Documentation
+    url: https://scottoffen.github.io/fluenthttpclient
+    about: Start here. Many questions are answered in the official docs.
+  - name: 💬 Community Discussions
+    url: https://github.com/scottoffen/fluenthttpclient/discussions
+    about: Propose ideas, ask how-to questions, and get community help.
+  - name: "🙋 StackOverflow #fluenthttpclient"
+    url: https://stackoverflow.com/questions/tagged/fluenthttpclient?sort=newest
+    about: Ask/answer usage questions with the fluenthttpclient tag.
+  - name: 🔒 Report a security vulnerability
+    url: https://github.com/scottoffen/fluenthttpclient/security/advisories/new
+    about: Please report vulnerabilities privately rather than as a public issue.

.github/ISSUE_TEMPLATE/documentation.yml

@@ -0,0 +1,34 @@
+name: 📖 Documentation update
+description: Fix or improve documentation (READMEs or Docusaurus).
+labels: ["documentation", "needs-triage"]
+assignees: []
+body:
+  - type: checkboxes
+    id: preflight
+    attributes:
+      label: Before you submit
+      options:
+        - label: I checked the latest published docs and the /docs source.
+          required: true
+        - label: I will keep the change clear, concise, and consistent with the existing documentation.
+          required: true
+
+  - type: textarea
+    id: location
+    attributes:
+      label: Affected pages/sections (optional)
+      description: Link the page(s) or file paths that need changes.
+      placeholder: /docs/getting-started.md
+
+  - type: textarea
+    id: change
+    attributes:
+      label: Proposed change
+      description: Be clear and concise. Include before/after snippets if helpful.
+      placeholder: |
+        **Before**
+        ...
+        **After**
+        ...
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,59 @@
+name: 💡 Feature request
+description: Propose a change that improves FluentHttpClient.
+labels: ["enhancement", "needs-triage"]
+assignees: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please **start in Discussions first** to validate the idea with the community.  
+        Create a feature request issue only after you've gathered positive feedback.
+
+  - type: checkboxes
+    id: preflight
+    attributes:
+      label: Before you submit
+      options:
+        - label: I have searched existing Issues and Discussions.
+          required: true
+        - label: I have read the [contribution guidelines](https://github.com/scottoffen/fluenthttpclient/blob/main/CONTRIBUTING.md).
+          required: true
+
+  - type: input
+    id: discussion-link
+    attributes:
+      label: Link to accepted Discussion
+      description: Paste the URL to the Discussion where consensus was reached.
+      placeholder: https://github.com/scottoffen/fluenthttpclient/discussions/123
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: Describe the **problem** this solves (not the solution).
+      placeholder: Users need to...
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed Solution
+      description: Outline how the solution would work at a high level.
+      placeholder: APIs, options, defaults, examples
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered (optional)
+      placeholder: Why not X? What tradeoffs did you consider?
+
+  - type: textarea
+    id: breaking
+    attributes:
+      label: Breaking Changes / Migration (optional)
+      description: Describe any breaking changes and proposed migration path.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,21 @@
+## Summary
+<!-- Clear list of what you changed; one feature per PR. -->
+
+## Related issue
+<!-- Closes #___ (use Closes/Fixes/Resolves to auto-close on merge). -->
+
+## Type
+- [ ] Bug fix
+- [ ] Feature
+- [ ] Docs
+- [ ] Other: ___
+
+## Checklist
+- [ ] Descriptive title and clear description
+- [ ] Tests added/updated (xUnit + Shouldly + Moq if needed)
+- [ ] Docs updated (if user-facing behavior changed)
+- [ ] No cosmetic/whitespace-only changes
+- [ ] Follows the [contribution guidelines](https://github.com/scottoffen/fluenthttpclient/blob/main/CONTRIBUTING.md) and C# conventions, with readability as a priority
+
+## Notes
+<!-- Breaking changes, migration notes, perf considerations, etc. -->

.github/workflows/cleanup.yml

@@ -0,0 +1,44 @@
+# Cleanup prereleases from GitHub Packages. Delegates to the shared
+# reusable workflow.
+#
+# Manual-only. Defaults to a dry run; the first run with any new mode or
+# day count should always be a dry run so I can verify the list of
+# versions about to be deleted before deletion actually happens.
+name: Cleanup Prerelease Packages
+
+on:
+  workflow_dispatch:
+    inputs:
+      mode:
+        description: 'Which versions to consider for deletion'
+        required: true
+        type: choice
+        default: prerelease-only
+        options:
+          - prerelease-only
+          - older-than-days
+      days:
+        description: 'For older-than-days mode: delete prereleases older than this many days'
+        required: false
+        type: number
+        default: 30
+      dry_run:
+        description: 'If true, lists what would be deleted without actually deleting'
+        required: false
+        type: boolean
+        default: true
+
+concurrency:
+  group: cleanup-packages
+  cancel-in-progress: false
+
+jobs:
+  cleanup:
+    uses: scottoffen/workflows/.github/workflows/dotnet-cleanup-packages.yml@v0
+    with:
+      mode: ${{ github.event.inputs.mode }}
+      days: ${{ fromJSON(github.event.inputs.days) }}
+      dry_run: ${{ github.event.inputs.dry_run == 'true' }}
+      package-names: |
+        FluentHttpClient
+    secrets: inherit

.github/workflows/deploy-docs.yml

@@ -0,0 +1,34 @@
+# Build and deploy the Docusaurus documentation site to GitHub Pages.
+# Delegates to the shared reusable workflow.
+#
+# One-time setup in this repo: Settings -> Pages -> Source -> "GitHub Actions".
+# Without that, the deploy step fails.
+name: Deploy Documentation
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    # Only rebuild when docs content or this workflow itself changes.
+    # Source-code commits that don't touch docs won't trigger a deploy.
+    paths:
+      - 'docs/**'
+      - '.github/workflows/deploy-docs.yml'
+
+jobs:
+  deploy:
+    uses: scottoffen/workflows/.github/workflows/docusaurus-deploy-pages.yml@v0
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+    # All defaults match the original workflow (docs path, Node 20, npm ci,
+    # npm run build), so most projects need no 'with:' block at all. Add
+    # inputs only if this repo deviates from the defaults, e.g.:
+    #
+    # with:
+    #   docs-path: website
+    #   node-version: '22'
+    #   install-command: pnpm install --frozen-lockfile
+    #   build-command: pnpm build