fix(repo): rename .giignore and update .gitignore rules

- Rename misspelled .giignore to .gitignore
- Add EasyEDA cache, Python bytecode, and virtual env rules
- Add KiCad build artifact exclusions

.giignore

@@ -1,69 +0,0 @@
-# Altium Designer Project Files
-
-# Project Output
-*.PcbDoc.htm
-*.SchDoc.htm
-
-# History and Backup Files
-History/
-__Backups/
-__Previews/
-*.~(pcbdoc|schdoc|outjob|pcb|sch)
-
-# Output Files
-Project Outputs for*/
-*.PDF
-*.DWF
-*.DXF
-*.ODB
-*.XLS
-*.CSV
-
-# Gerber Files
-*.GBR
-*.GBO
-*.GBP
-*.GBS
-*.GKO
-*.GKP
-*.GTL
-*.GTO
-*.GTP
-*.GTS
-
-# NC Drill Files
-*.NC
-*.XNC
-*.TXT
-
-# Assembly Files
-*.Txt
-
-# CAM Files
-*.CAM
-
-# Libraries
-*.IntLib
-*.PcbLib
-*.SchLib
-*.LibPkg
-
-# Temporary Files
-*.tmp
-~*.tmp
-
-# State Files
-*.dpk
-State/
-
-# OS Files
-.DS_Store
-Thumbs.db
-
-# IDE
-.vs/
-.vscode/
-
-# Build Artifacts
-bin/
-obj/

.gitignore

@@ -0,0 +1,72 @@
+# ============================================
+# savearth Flow Meter PCB — .gitignore
+# ============================================
+
+# ----- KiCad (Primary Design Tool) -----
+
+# Backup files
+*.bak
+*.kicad_pcb-bak
+*.kicad_sch-bak
+*-backups/
+
+# Auto-save files
+\#auto_saved_files\#
+*.000
+
+# Lock files
+*.kicad_pcb.lck
+*.kicad_sch.lck
+
+# Cache files
+*-cache.lib
+*-rescue.lib
+fp-info-cache
+.easyeda_cache/*
+
+# Generated netlists (regenerated from source)
+*.net
+
+# ----- Altium Designer (Legacy) -----
+
+# Project Output
+*.PcbDoc.htm
+*.SchDoc.htm
+
+# History and Backup Files
+History/
+__Backups/
+__Previews/
+
+# Output Files
+Project Outputs for*/
+
+# Temporary Files
+*.tmp
+~*.tmp
+
+# State Files
+*.dpk
+State/
+
+# ----- EasyEDA Pro -----
+# (binary .eprj kept as archive, but ignore temp files)
+*.eprj-journal
+*.eprj-wal
+
+# ----- General -----
+
+# OS Files
+.DS_Store
+Thumbs.db
+
+# IDE
+.vs/
+.vscode/
+
+# Build Artifacts
+bin/
+obj/.easyeda_cache/
+
+.agent/*
+!.agent/.gitkeep