v2.1.0 — per-export line numbers

Added

Source line numbers on every export — requested by a user so AI agents can jump straight to an implementation instead of reading the whole file.

• Markdown output: each signature ends with // :N (its 1-based line in the source file), and the preamble tells the agent what the suffix means:

  export function formatLocal(isoString: string): string; // :12

• JSON output (--format=json) and the MCP get_context tool: each export gains a "line" field.
• Zero config — always on, ~2 tokens per export.

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