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-# Elisp / Emacs Rules
-
-Applies to: `**/*.el`
-
-## Style
-
-- 2-space indent, no tabs
-- Hyphen-case for identifiers: `cj/do-thing`, not `cj/doThing`
-- Naming prefixes:
-  - `cj/name` — user-facing functions and commands (bound to keys, called from init)
-  - `cj/--name` — private helpers (double-dash signals "internal")
-  - `<module>/name` — module-scoped where appropriate (e.g., `calendar-sync/parse-ics`)
-- File header: `;;; foo-config.el --- brief description -*- lexical-binding: t -*-`
-- `(provide 'foo-config)` at the bottom of every module
-- `lexical-binding: t` is mandatory — no file without it
-
-## Function Design
-
-- Keep functions under 15 lines where possible
-- One responsibility per function
-- Extract helpers instead of nesting deeply — 5+ levels of nesting is a refactor signal
-- Prefer named helpers over lambdas for anything nontrivial
-- No premature abstraction — three similar lines beats a clever macro
-
-Small functions are the single strongest defense against paren errors. Deeply nested code is where AI and humans both fail.
-
-## Requires and Loading
-
-- Every `(require 'foo)` must correspond to a loadable file on the load-path
-- Byte-compile warnings about free variables usually indicate a missing `require` or a typo in a symbol name — read them
-- Use `use-package` for external (MELPA/ELPA) packages
-- Use plain `(require 'foo-config)` for internal modules
-- For optional features, `(when (require 'foo nil t) ...)` degrades gracefully if absent
-
-## Lexical-Binding Traps
-
-- `(boundp 'x)` where `x` is a lexical variable always returns nil. Bind with `defvar` at top level if you need `boundp` to work, or use the value directly.
-- `setq` on an undeclared free variable is a warning — use `let` for locals or `defvar` for module-level state
-- Closures capture by reference. Avoid capturing mutating loop variables in nested defuns.
-
-## Regex Gotchas
-
-- `\s` is NOT whitespace in Emacs regex. Use `[ \t]` or `\\s-` (syntax class).
-- `^` in `string-match` matches after `\n` OR at position 0 — use `(= (match-beginning 0) start)` for positional checks when that matters.
-- `replace-regexp-in-string` interprets backslashes in the replacement. Pass `t t` (FIXEDCASE LITERAL) when the replacement contains literal backslashes.
-
-## Keybindings
-
-- `keymap-global-set` for global; `keymap-set KEYMAP ...` for mode-local
-- Group module-specific bindings inside the module's file
-- Autoload cookies (`;;;###autoload`) don't activate through plain `(require ...)` — use the form directly, not an autoloaded wrapper
-
-## Module Template
-
-```elisp
-;;; foo-config.el --- Foo feature configuration -*- lexical-binding: t -*-
-
-;;; Commentary:
-;; One-line description.
-
-;;; Code:
-
-;; ... code ...
-
-(provide 'foo-config)
-;;; foo-config.el ends here
-```
-
-Then `(require 'foo-config)` in `init.el` (or a config aggregator).
-
-## Editing Workflow
-
-- A PostToolUse hook runs `check-parens` and `byte-compile-file` on every `.el` save
-- If it blocks, read the error — don't retry blindly
-- Prefer Write over repeated Edits for nontrivial new code; incremental edits accumulate subtle paren mismatches