docs: add metadata to all non-autogenerated files

Author: tmihoc

docs/contributor/howto/compile-and-run-juju-agents-on-different-architectures.md

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+---
+myst:
+  html_meta:
+    description: "Build and deploy Juju agents across multiple architectures using local simplestreams repositories for cross-platform testing."
+---
+
 (compile-and-run-juju-agents-on-different-architectures)=
 # Compile and run Juju agents on different architectures
 

docs/contributor/howto/create-a-unit-test-suite.md

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+---
+myst:
+  html_meta:
+    description: "Build unit test suites for Juju with proper setup and teardown logic using BaseSuite and gocheck test patterns."
+---
+
 (create-a-unit-test-suite)=
 # Create a unit test suite
 > See also: {ref}`unit-test-suite`

docs/contributor/howto/create-new-mongo-db-collection.md

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+---
+myst:
+  html_meta:
+    description: "Add new MongoDB collections to Juju's state package, define entity structures, and implement proper document validation patterns."
+---
+
 # Create a new MongoDB collection
 Sometimes developers need to store some new entities in Juju DB. This document provides key points for adding a new
 collection to MongoDB.

docs/contributor/howto/debug-a-dqlite-core-dump-issue.md

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+---
+myst:
+  html_meta:
+    description: "Diagnose and debug Dqlite core dump issues in Juju 3.2+, including validation checks and backtrace collection for issue resolution."
+---
+
 (debug-a-dqlite-core-dump-issue)=
 # Debug a Dqlite core dump issue
 

docs/contributor/howto/index.md

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+---
+myst:
+  html_meta:
+    description: "Explore step-by-step how-to guides for Juju developers covering testing, debugging, MongoDB management, and cross-architecture development."
+---
+
 (contributor-how-to-guides)=
 # How-to guides
 

docs/contributor/howto/manage-mongodb.md

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+---
+myst:
+  html_meta:
+    description: "Configure MongoDB profiling, optimize query performance, and manage database operations for Juju development and debugging."
+---
+
 (manage-mongodb)=
 # Manage MongoDB
 

docs/contributor/howto/merge-forward.md

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+---
+myst:
+  html_meta:
+    description: "Merge bug fixes and patches forward across Juju version branches, handling conflicts and maintaining version compatibility."
+---
+
 # Merge forward
 
 Juju generally has multiple versions in concurrent development, and we keep a separate Git branch for each. Often, a bug

docs/contributor/howto/write-a-unit-test.md

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+---
+myst:
+  html_meta:
+    description: "Learn how to write unit tests for Juju using gocheck, including creating test files, suites, and implementing effective test patterns."
+---
+
 (write-a-unit-test)=
 # Write a unit test
 > See also: {ref}`unit-testing`

docs/contributor/howto/write-an-integration-test.md

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+---
+myst:
+  html_meta:
+    description: "Create integration tests for Juju using bash test suites, including bootstrapping, test execution, and teardown procedures."
+---
+
 (write-an-integration-test)=
 # Write an integration test
 > See also: {ref}`integration-testing`

docs/contributor/howto/write-tests.md

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+---
+myst:
+  html_meta:
+    description: "Master writing tests for Juju using go test and gocheck, including unit and integration testing best practices for contributors."
+---
+
 (write-tests)=
 # Write tests