v0.4.0 -> v0.5.0

Summary

Add three new built-in tools (fetch_page, search_web, calculate) and a headless Chrome browser subsystem, bringing the total to 14 tools. Simultaneously refactor the tool executor routing layer by extracting per-package Routes functions, improving modularity and Context propagation across the execution pipeline.

Changes

FEAT

• Add fetch_page tool: launch headless Chrome with stealth JS injection, wait for full JS render, return page content as Markdown
• Add search_web tool: concurrent Brave Search + DuckDuckGo query with deduplication, time-range filtering, and configurable result limit (max 50)
• Add calculate tool: evaluate math expressions supporting +, -, *, /, %, ^ (power), parentheses, and functions (sqrt, abs, pow, ceil, floor, round, log, log2, log10, sin, cos, tan)
• Add search_content as a first-class file package tool, moved from executor dispatch into file package

REFACTOR

• Extract file.Routes function to consolidate all file tool dispatch (read, list, glob, write, patch, search) into the file package, removing inline logic from executor
• Extract apis.Routes function to consolidate API tool dispatch (yahoo_finance, google_rss, weather, http_request, fetch_page, search_web) into the apis package
• Rename file tool source files to shorter names (readFile.go → read.go, listFiles.go → list.go, etc.) for consistency
• Refactor tool confirmation flow to synchronous reply-channel pattern; fix Context cancellation propagation through Execute loop
• Pass context.Context through tools.Execute call chain to enable per-tool timeout and cancellation

UPDATE

• Change Copilot default model from gpt-5-mini to gpt-4.1
• Increase run_command execution timeout from 120s to 300s
• Update system prompt and base system prompt to document new tools and revised execution guidelines
• Add raw-body shortcut in utils.GET and utils.POST generic functions: if T is string, response body is read as plain text without JSON/XML decode

Files Changed

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