feat: add MCP server config + MCP tools for Pi/CCSDK

…us-4.6 to Copilot models

- Add normalizeBraveLang() to map bare 'zh' to 'zh-hans' for Brave Search API (openclaw#64)
- Update GitHub Copilot model list with full catalog including claude-opus-4.6 (openclaw#59)
- resolveImplicitCopilotProvider now provides complete model definitions
- Add unit tests for language normalization

Closes openclaw#64, Closes openclaw#59

Co-Authored-By: Warp <[email protected]>

- Add limitHistoryByTokenBudget() function with sliding window approach
- Integrates after turn-based limiting to enforce token count ceiling
- Default 12,000 token budget (conservative for system prompt + response)
- Graceful error handling: falls back to full history if estimation fails
- Safety guarantee: always keeps at least the last message

Config integration:
- Add agents.defaults.promptTokenBudget config option (optional)
- Reads from params.config?.agents?.defaults?.promptTokenBudget
- Uses estimateTokens() from @mariozechner/pi-coding-agent

Files modified:
- src/agents/pi-embedded-runner/history.ts: new limitHistoryByTokenBudget()
- src/agents/pi-embedded-runner/compact.ts: integrate token budget limiting
- src/config/types.agent-defaults.ts: add promptTokenBudget config type
- src/agents/pi-embedded-runner.limithistorybytoken-budget.test.ts: test coverage

Fixes openclaw#59

- Add Zod schema validation for agents.defaults.promptTokenBudget
- Allows runtime config validation to accept the new optional field
- Completes Issue openclaw#59 implementation (missing validation schema)

Related to: 0df4ce6

Add Recording Overlay

…udgets (openclaw#76 openclaw#75 openclaw#59)

Auto-detect and include TypeScript type definitions from src/types or
types directory in agent system prompts. This prevents agents from
creating incompatible type systems by ensuring they see existing types
before implementing features.

Changes:
- Add type-definitions.ts module to scan and load type definitions
- Integrate type definitions into bootstrap context resolution
- Inject type definitions prompt before project context files
- Add explicit instruction to use only existing types
- Include barrel export (index.ts) first for visibility
- Add comprehensive test coverage

Fixes openclaw#59

- Auto-detect and fetch type definitions from src/types/ or types/ directory
- Include all .ts and .d.ts files in sub-agent prompts
- Add explicit instruction to use ONLY existing types
- Apply to both issue-fix and review-fix sub-agents
- Prevents type system incompatibilities when agents create implementations

Closes openclaw#59