Add GİB özelge (tax rulings) MCP module

Introduces two tools backed by the gib.gov.tr public JSON API
(reverse-engineered from the Next.js SPA chunks):

- search_gib_ozelge: keyword, ozelgeNo, kanunNo, date-range, paging
  over 18k+ Revenue Administration tax rulings. Simple YYYY-MM-DD
  dates are auto-expanded to ISO 8601 to satisfy the backend.
- get_gib_ozelge_document_markdown: fetch a single ruling by numeric
  id and return 5000-char paginated Markdown with a metadata header
  block (title, ozelgeNo, tarih, kanun, kaynak).

Also prunes stale auth/Fly.io-era entries from uv.lock.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

gib_mcp_module/models.py

@@ -0,0 +1,64 @@
+# gib_mcp_module/models.py
+
+from pydantic import BaseModel, Field
+from typing import List, Optional
+
+
+class GibSearchRequest(BaseModel):
+    """
+    Request model for searching GİB özelgeler (Turkish Revenue Administration tax rulings).
+
+    GİB (Gelir İdaresi Başkanlığı) publishes official tax-ruling letters
+    ("özelge") responding to taxpayer questions on VAT, income tax,
+    corporate tax, stamp duty, and other tax matters. 18,000+ rulings
+    are searchable via the public gib.gov.tr API.
+    """
+    keywords: str = Field("", description="Keywords searched across title, kanunNo and description (Turkish)")
+    ozelgeNo: str = Field("", description="Exact özelge reference number (e.g., 'E-40247694-130-15524')")
+    kanunNo: str = Field("", description="Law number filter, e.g. '3065' for KDV")
+    kanunId: int = Field(0, description="Optional numeric law ID filter (0=ignore)")
+    ozelgeStartDate: str = Field("", description="Start date YYYY-MM-DD or full ISO 8601")
+    ozelgeEndDate: str = Field("", description="End date YYYY-MM-DD or full ISO 8601")
+    page: int = Field(1, ge=1, description="Page number (1-indexed)")
+    pageSize: int = Field(10, ge=1, le=50, description="Results per page (1-50)")
+
+
+class GibOzelgeSummary(BaseModel):
+    """Summary of a single GİB özelge from search results (no full HTML)."""
+    id: int = Field(..., description="Numeric özelge ID for document retrieval")
+    ozelgeNo: Optional[str] = Field(None, description="Official ruling reference number")
+    ozelgeTarih: Optional[str] = Field(None, description="Ruling date (ISO datetime)")
+    title: Optional[str] = Field(None, description="Subject/title of the ruling")
+    kanunNo: Optional[str] = Field(None, description="Law number (e.g., '3065')")
+    kanunTitle: Optional[str] = Field(None, description="Law title (e.g., 'KATMA DEĞER VERGİSİ KANUNU')")
+    siteLink: Optional[str] = Field(None, description="Direct URL to the ruling on gib.gov.tr")
+
+
+class GibSearchResult(BaseModel):
+    """Response model for GİB özelge search results."""
+    ozelgeler: List[GibOzelgeSummary] = Field(default_factory=list, description="Matching özelge summaries")
+    total_results: int = Field(0, description="Total number of matching özelgeler across all pages")
+    total_pages: int = Field(0, description="Total number of pages for this query")
+    current_page: int = Field(1, description="Current page (1-indexed)")
+    page_size: int = Field(10, description="Results per page")
+
+
+class GibDocumentMarkdown(BaseModel):
+    """
+    GİB özelge document converted to paginated Markdown.
+
+    Long rulings are split into 5000-character chunks; request successive
+    pages via page_number to read the full text.
+    """
+    ozelge_id: int = Field(..., description="Numeric özelge ID")
+    ozelge_no: Optional[str] = Field(None, description="Official ruling reference number")
+    title: Optional[str] = Field(None, description="Subject/title of the ruling")
+    ozelge_tarih: Optional[str] = Field(None, description="Ruling date (ISO datetime)")
+    kanun_title: Optional[str] = Field(None, description="Related law title")
+    kanun_no: Optional[str] = Field(None, description="Related law number")
+    site_link: Optional[str] = Field(None, description="Direct URL to the ruling on gib.gov.tr")
+    markdown_chunk: Optional[str] = Field(None, description="Current 5000-character Markdown chunk")
+    current_page: int = Field(1, description="Current page number (1-indexed)")
+    total_pages: int = Field(0, description="Total pages for the full Markdown content")
+    is_paginated: bool = Field(False, description="True if split across multiple pages")
+    error_message: Optional[str] = Field(None, description="Populated when retrieval failed")