diff --git a/.cursorrules b/.cursorrules
deleted file mode 100644
index db7b6d3c..00000000
--- a/.cursorrules
+++ /dev/null
@@ -1,18 +0,0 @@
-This project uses ruff for Python linting and formatting.
-
-Rules:
-- Line length: 100 characters
-- Python target: 3.11+
-- Use double quotes for strings
-- Sort imports with isort (ruff I rules): stdlib, third-party, first-party (framework), local
-- Combine as-imports
-- Use type hints on all function signatures
-- Use `from __future__ import annotations` for modern type syntax
-- Raise exceptions with `from` in except blocks (B904)
-- No unused imports (F401), no unused variables (F841)
-- Prefer list/dict/set comprehensions over map/filter (C4)
-
-Run `make lint` to auto-fix, `make check` to verify without modifying files.
-Run `make format` to apply ruff formatting.
-
-The ruff config lives in core/pyproject.toml under [tool.ruff].
diff --git a/.dockerignore b/.dockerignore
deleted file mode 100644
index efb22d1c..00000000
--- a/.dockerignore
+++ /dev/null
@@ -1,35 +0,0 @@
-# Git
-.git/
-.gitignore
-
-# Documentation
-*.md
-docs/
-LICENSE
-
-# IDE
-.idea/
-.vscode/
-
-# Dependencies (rebuilt in container)
-node_modules/
-
-# Build artifacts
-dist/
-build/
-coverage/
-
-# Environment files
-.env*
-config.yaml
-
-# Logs
-*.log
-logs/
-
-# OS
-.DS_Store
-Thumbs.db
-
-# GitHub
-.github/
diff --git a/.editorconfig b/.editorconfig
index 252d4146..103c07b9 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -22,3 +22,6 @@ indent_size = 2
 
 [Makefile]
 indent_style = tab
+
+[*.{sh,ps1}]
+end_of_line = lf
diff --git a/.gitattributes b/.gitattributes
index 3db0e152..24548be8 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -16,7 +16,6 @@
 
 # Shell scripts (must use LF)
 *.sh text eol=lf
-quickstart.sh text eol=lf
 
 # PowerShell scripts (Windows-friendly)
 *.ps1 text eol=lf
@@ -122,3 +121,8 @@ CODE_OF_CONDUCT* text
 *.db binary
 *.sqlite binary
 *.sqlite3 binary
+
+# Lockfiles — mark generated so GitHub collapses them in PR diffs
+*.lock            linguist-generated=true -diff
+package-lock.json linguist-generated=true -diff
+uv.lock           linguist-generated=true -diff
diff --git a/docs/contributing-lint-setup.md b/docs/contributing-lint-setup.md
index f597da0a..d2d7cbd3 100644
--- a/docs/contributing-lint-setup.md
+++ b/docs/contributing-lint-setup.md
@@ -98,10 +98,6 @@ For any editor, you can always rely on `make lint` and `make format` from the co
 
 The repository includes a `.claude/settings.json` hook that automatically runs `ruff check --fix` and `ruff format` after every file edit made by Claude Code. No setup needed — it works out of the box.
 
-### Cursor
-
-The `.cursorrules` file at the repo root tells Cursor's AI the project's style rules (line length, import order, quote style, etc.) so generated code follows convention.
-
 ### Codex CLI
 
 Codex CLI (OpenAI, v0.101.0+) is supported via `.codex/config.toml` (MCP server config). This file is tracked in git. Run `codex` in the repo root to use the configured MCP tools. See the [Codex CLI section in the README](../README.md#codex-cli) for details.
@@ -137,7 +133,6 @@ make check    # Verify locally before pushing
 | `.pre-commit-config.yaml` | Pre-commit hook definitions |
 | `.vscode/settings.json` | VS Code ruff integration |
 | `.vscode/extensions.json` | Recommended VS Code extensions |
-| `.cursorrules` | AI assistant context |
 | `.claude/settings.json` | Claude Code post-edit hooks |
 
 The single source of truth for lint rules is the `[tool.ruff]` section in each package's `pyproject.toml`. All other configs (VS Code, pre-commit, Makefile, CI) reference these.
diff --git a/tsconfig.base.json b/tsconfig.base.json
deleted file mode 100644
index b348bb90..00000000
--- a/tsconfig.base.json
+++ /dev/null
@@ -1,24 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/tsconfig",
-  "compilerOptions": {
-    "target": "ES2022",
-    "lib": ["ES2022"],
-    "module": "NodeNext",
-    "moduleResolution": "NodeNext",
-    "resolveJsonModule": true,
-    "declaration": true,
-    "declarationMap": true,
-    "sourceMap": true,
-    "strict": true,
-    "noImplicitAny": true,
-    "strictNullChecks": true,
-    "noImplicitReturns": true,
-    "noFallthroughCasesInSwitch": true,
-    "noUncheckedIndexedAccess": true,
-    "esModuleInterop": true,
-    "allowSyntheticDefaultImports": true,
-    "forceConsistentCasingInFileNames": true,
-    "skipLibCheck": true,
-    "isolatedModules": true
-  }
-}