feat(dx): define repository config boundary

[DecisionNerd]

Closes #225\n\nDefines proposed ADR 0016 plus the closed project and resolved configuration schemas that gate the remaining #219 slices. The contract keeps actual GraphForge/source data out of code Git, preserves Rust ownership, and separates portable intent from Pulumi/Terraform provider inputs.\n\nValidation:\n- uv run --extra dev pytest -q tests/unit/test_graphforge_config_contract.py\n- uv run --extra dev ruff check tests/unit/test_graphforge_config_contract.py\n- pnpm docs:build\n- pnpm docs:check-links\n- git diff --check

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Note

Define .graphforge/ repository configuration boundary with versioned JSON Schema contracts

• Adds ADR 0016 (0016-repository-integration-and-deployment-configuration.md) defining the .graphforge/ directory as the boundary for repository integration and deployment configuration.
• Introduces two closed JSON Schema (draft 2020-12) contracts: graphforge-project-config-v1.schema.json for project config and graphforge-resolved-config-v1.schema.json for resolved (secret-free) IaC output.
• Adds canonical YAML and JSON examples for both contracts and validates them in tests/unit/test_graphforge_config_contract.py, enforcing closed object schemas, secret-free resolved output, and canonical serialization.
• Adds jsonschema>=4.23 to the dev optional dependencies in pyproject.toml to support schema validation in tests.
• Updates the docs site sidebar and sync script to include ADR 0016.

^{Macroscope summarized 62e09be.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 6aacbb8 and 62e09be.

⛔ Files ignored due to path filters (12)

• CHANGELOG.md is excluded by !**/*.md
• docs/adr/0016-repository-integration-and-deployment-configuration.md is excluded by !**/*.md, !**/docs/**
• docs/adr/README.md is excluded by !**/*.md, !**/docs/**
• docs/book/architecture/overview.md is excluded by !**/*.md, !**/docs/**
• docs/contracts/examples/graphforge-resolved-v1.json is excluded by !**/docs/**, !**/examples/**
• docs/contracts/examples/graphforge-v1.yaml is excluded by !**/docs/**, !**/examples/**
• docs/contracts/graphforge-project-config-v1.schema.json is excluded by !**/docs/**
• docs/contracts/graphforge-resolved-config-v1.schema.json is excluded by !**/docs/**
• docs/engineering/ARCHITECTURE.md is excluded by !**/*.md, !**/docs/**
• docs/engineering/adrs/README.md is excluded by !**/*.md, !**/docs/**
• docs/reference/changelog.md is excluded by !**/*.md, !**/docs/**
• uv.lock is excluded by !**/*.lock, !**/*.lock

📒 Files selected for processing (4)

• docs-site/astro.config.mjs
• docs-site/scripts/sync-content.mjs
• pyproject.toml
• tests/unit/test_graphforge_config_contract.py

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