Add support for JS/TS entry point detection for LLMs

[vinmay]

TypeScript/JavaScript Entry Point Detection

Added src/agent_scan/ts_entry_points.py — a new module that detects LLM-callable functions in TypeScript and JavaScript source files using regex-based
pattern matching, without requiring a Node.js runtime. Wired into scanner.py and text_reporter.py so results appear in every scan.

Four detection patterns are covered:

• mcp_tool — server.tool("name", schema, handler) — the standard MCP SDK registration call, both inline and multi-line (where the name is on the line
  after the opening parenthesis)
• mcp_handler — server.setRequestHandler(Schema, handler) — MCP request handler registration, both inline and multi-line
• mcp_tool_definition — { name: "...", description: ..., inputSchema: ... } — the canonical MCP tool object format, used when tools are defined as typed
  schema objects (Zod ToolSchema<> pattern) or returned as arrays from a factory function
• langchain_tool — new DynamicTool({ name: "...", ... }) — LangChain.js tool registration, both inline and multi-line

File filtering skips node_modules, dist, build, .d.ts declaration files, .test.ts/.spec.ts files, and .min.js bundles. The multi-line variants for
server.tool( and setRequestHandler( use a strict 1-line lookahead — if the first argument isn't a string literal on the very next line, it's treated as
dynamic and skipped, which prevents picking up description strings as tool names.

Validated against 8 real-world TypeScript MCP repos: exa-mcp-server (9 tools), mcp-server-cloudflare (122 tools across a monorepo), mcp-server-browserbase
(9 tools), mcp-playwright (33 tools), tavily-mcp (5 tools). No false positives found in spot-checking the full 122-entry cloudflare results.

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Unsupported Language Detection

When a scan finds no Python or TypeScript files, the report now detects what languages are actually present and names them. A map of 28 languages (Go,
Rust, Ruby, Java, Kotlin, Scala, C#, C++, Swift, Elixir, and more) is checked against file extensions, with standard noise directories excluded. The
output looks like:

No Python or TypeScript files were found for analysis.
Detected: Go (146 files)
agent-scan currently supports Python (full analysis) and TypeScript (entry points).

Previously the message was the same whether you scanned a Go repo or an empty directory. Now it's actionable.