feat: datasheet tools + fix missing delete_schematic_component

New tools - datasheet:
- get_datasheet_url: construct LCSC datasheet PDF URL + product page URL
  without any API key (URL schema: https://www.lcsc.com/datasheet/<C#>.pdf)
- enrich_datasheets: scan .kicad_sch, write LCSC datasheet URL into every
  symbol that has an LCSC property but an empty Datasheet field; supports
  dry_run=true for preview; text-based implementation (no skip writes)
  Implementation: python/commands/datasheet_manager.py

New tool - schematic:
- delete_schematic_component: remove a placed symbol from a .kicad_sch file
  by reference designator (e.g. R1, U3)

Bug fix - delete_schematic_component (two separate root causes):
1. No MCP tool named delete_schematic_component was registered at all.
   Any delete-symbol request fell through to the PCB-only delete_component
   tool which searches pcbnew.BOARD and always returned 'Component not found'
   for schematic symbols.
2. component_schematic.py::remove_component() still used skip for writes.
   PR #40 rewrote DynamicSymbolLoader (add path) to avoid skip-induced
   schematic corruption, but the delete path was not touched by that PR.

Fix: _handle_delete_schematic_component in kicad_interface.py uses direct
text manipulation with parenthesis-depth tracking (same technique as PR #40),
bypassing component_schematic.py entirely. Error message explicitly guides
users: 'use delete_component for PCB footprints'.

Files changed:
- python/commands/datasheet_manager.py (new)
- src/tools/datasheet.ts (new)
- python/kicad_interface.py: 3 new handlers + dispatch entries
- src/tools/schematic.ts: delete_schematic_component tool
- src/server.ts: registerDatasheetTools import + call
- src/tools/index.ts: export registerDatasheetTools
- CHANGELOG.md: document all above

CHANGELOG.md

@@ -36,6 +36,45 @@ All notable changes to the KiCAD MCP Server project are documented here.
 - `library.py`: Fix loop variable shadowing `Path` object (mypy)
 - `design_rules.py`: Add type annotation for `violation_counts` (mypy)
 
+### Pending additions (not yet committed)
+
+**Datasheet tools:**
+- `get_datasheet_url` - Return LCSC datasheet PDF URL and product page URL for a given
+  LCSC number (e.g. `C179739` → `https://www.lcsc.com/datasheet/C179739.pdf`).
+  No API key required – URL is constructed directly from the LCSC number.
+- `enrich_datasheets` - Scan a `.kicad_sch` file and write LCSC datasheet URLs into
+  every symbol that has an `LCSC` property but an empty `Datasheet` field. After
+  enrichment the URL appears natively in KiCAD's symbol properties, footprint browser
+  and any other tool that reads the standard KiCAD `Datasheet` field.
+  Supports `dry_run=true` for preview without writing.
+  Implementation: `python/commands/datasheet_manager.py` (text-based, no `skip` writes)
+
+**Schematic tools:**
+- `delete_schematic_component` - Remove a placed symbol from a `.kicad_sch` file by
+  reference designator (e.g. `R1`, `U3`).
+
+### Bug Fixes (pending)
+
+- `schematic.ts` / `kicad_interface.py`: Fix missing `delete_schematic_component` MCP tool.
+
+  **Root cause (two separate issues):**
+  1. No MCP tool named `delete_schematic_component` existed. Claude had no way to call
+     it, so any "delete schematic component" request fell through to the PCB-only
+     `delete_component` tool, which searches `pcbnew.BOARD` and always returned
+     "Component not found" for schematic symbols.
+  2. `component_schematic.py::remove_component()` still used `skip` for writes.
+     PR #40 rewrote `DynamicSymbolLoader` (add path) to avoid `skip`-induced schematic
+     corruption, but `remove_component` (delete path) was not touched by that PR.
+
+  **Fix:**
+  - Added `delete_schematic_component` to the TypeScript tool layer (`schematic.ts`)
+    with clear docstring distinguishing it from the PCB `delete_component`.
+  - Implemented `_handle_delete_schematic_component` in `kicad_interface.py` using
+    direct text manipulation (parenthesis-depth tracking, same approach as PR #40).
+    Does not call `component_schematic.py::remove_component()` at all.
+  - Error message explicitly guides the user when the wrong tool is used:
+    *"note: this tool removes schematic symbols, use delete_component for PCB footprints"*
+
 ### Pending fixes (not yet committed)
 
 - `connection_schematic.py` / `kicad_interface.py`: Fix `generate_netlist` missing