- Added Brave web search provider with support for query, result count, and recency filtering.
- Added BRAVE_API_KEY environment variable configuration for Brave search authentication.
- Updated web search provider priority order to include Brave as second-highest priority after Exa.
- Extended recency filter support to Brave search provider alongside Perplexity.
- Implemented BraveProvider class with API integration, response mapping, and parameter validation.
- Added helper functions for recency mapping, result clamping, and snippet building in Brave provider.
- Restructured documentation from user-facing guides to technical implementation references across 18 files in packages/coding-agent/docs.
- Reorganized compaction.md, config-usage.md, custom-tools.md, and extensions.md to emphasize architecture and integration patterns over step-by-step tutorials.
- Expanded environment-variables.md, extension-loading.md, fs-scan-cache-architecture.md, and python-repl.md with detailed runtime behavior and implementation details.
- Consolidated hooks.md, rpc.md, sdk.md, and theme.md from comprehensive reference documentation to focused technical specifications.
- Refined session.md, session-tree-plan.md, skills.md, tree.md, and tui.md to clarify runtime behavior, discovery mechanisms, and technical contracts.
- Added comprehensive environment variables documentation including API keys for 11 new LLM providers (Groq, Cerebras, xAI, OpenRouter, Mistral, z.ai, MiniMax, OpenCode, Cursor, Vercel AI Gateway, Perplexity) and cloud provider configuration.
- Expanded CLI help text with detailed API keys section documenting all supported LLM providers, cloud providers, search services, and model override configuration variables.
- Fixed redundant fallback check in porting guide example by removing duplicate `Bun.env.HOME` reference.
- Migrated all environment variable access from Node.js `process.env` to Bun runtime `Bun.env` API across the entire codebase.
- Updated 71 files including source code, tests, documentation, and configuration to use Bun's native environment variable API.
- Added comprehensive environment variables documentation in `packages/coding-agent/docs/environment-variables.md` covering 100+ environment variables organized by category.
- Updated CHANGELOG entries to reflect migration from `process.env` to `Bun.env` and environment variable prefix changes (PI_* vs OMP_*).
- Maintained identical behavior and logic across all changes - only the environment variable access method was updated.
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