feat: add claude wrapper that auto-links AGENTS.md as CLAUDE.md

New functions/claude.fish wraps the claude CLI. Before launch it checks the
current directory and the git project root; when CLAUDE.md is absent but
AGENTS.md is present, it creates a relative symlink CLAUDE.md -> AGENTS.md so
Claude Code picks up shared agent instructions without duplicating the file.
Arguments are forwarded verbatim.

Implemented as a C1 command shadow: when __fish_config_op_aliases (or the
master __fish_config_opinionated) is disabled, the call passes through to the
bare claude binary unchanged. Link-creation notices print to stderr in green.

Documents the new shadow in docs/fish-config.md (section 5.12 AI tools, C1
component reference table, and C1 summary list) and adds a claude-cli anchor
to docs/fish-config.index.

docs/fish-config.index

@@ -130,6 +130,7 @@ logs=### logs
 smart-exit=### smart_exit
 ai=## 5.12 AI and Developer Tools
 antigravity=### antigravity
+claude-cli=### claude
 claude=### claude-resume
 claude-docs=### claude-docs
 claude-pr=### claude-pr

docs/fish-config.md

@@ -1106,6 +1106,20 @@ Add -i (interactive confirmation) to destructive commands:
     file in the current directory, or opens an interactive fzf picker if no
     session file is found.
 
+### claude
+
+    Synopsis:  claude [args...]
+    Wrapper for the claude CLI. Before launching, checks the current
+    directory and the git project root for CLAUDE.md; when it is absent but
+    AGENTS.md is present, creates a relative symlink CLAUDE.md -> AGENTS.md
+    so Claude Code picks up shared agent instructions without duplicating
+    the file. All arguments are forwarded verbatim. Command shadow (C1):
+    when __fish_config_op_aliases (or the master) is disabled, the call is
+    passed through to the real claude binary unchanged.
+
+    claude
+    claude --resume
+
 ### claude-resume
 
     Synopsis:  claude-resume
@@ -1459,7 +1473,8 @@ but a category with an explicit truthy value remains enabled regardless.
                                     ping->prettyping, ssh->kitten,
                                     du->duf/dust, mkdir/bash wrappers,
                                     history timestamps, grep/cp/mv/wget
-                                    flag injection, help intercept
+                                    flag injection, help intercept, claude
+                                    AGENTS.md auto-link
     __fish_config_op_autoexec       Startup side-effects: Fisher
                                     bootstrap, theme apply, paru/yay
                                     wrapper generation, auto venv
@@ -1545,6 +1560,7 @@ all of these commands.
     grep/fgrep/egrep   forced --color=auto                    system grep variants
     dir / vdir         forced --color=auto                    system dir / vdir
     help config        intercepts "help config" → config-help fish builtin help
+    claude             auto-links AGENTS.md as CLAUDE.md before launch command claude
 
 When C1 is disabled, `rm` uses bare `command rm` with no wrapper — files
 are permanently deleted, not trashed. There is no intermediate safety net.

functions/claude.fish

@@ -0,0 +1,64 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   claude [ARGS...]
+#
+# DESCRIPTION
+#   Wrapper for the claude CLI that ensures CLAUDE.md exists before launch.
+#   Both the current directory and the git project root are checked. When
+#   CLAUDE.md is absent but AGENTS.md is present in a checked directory, a
+#   relative symlink CLAUDE.md -> AGENTS.md is created automatically so that
+#   Claude Code picks up shared agent instructions without duplicating the
+#   file. All arguments are forwarded verbatim to the real claude binary.
+#
+#   Opinionated component (C1): when disabled via __fish_config_op_aliases
+#   (or the __fish_config_opinionated master), the command is passed through
+#   to the real claude binary unchanged.
+#
+# ARGUMENTS
+#   ARGS  Any arguments forwarded verbatim to the underlying claude binary
+#
+# RETURNS
+#   Exit status of the underlying claude binary
+#
+# EXAMPLE
+#   claude
+#   claude --resume
+#   claude "Explain the recent changes"
+function claude --wraps=claude --description 'claude wrapper: auto-links AGENTS.md as CLAUDE.md'
+    if not __fish_config_op_enabled __fish_config_op_aliases
+        command claude $argv
+        return $status
+    end
+
+    set -l c_ok    (set_color green)
+    set -l c_reset (set_color normal)
+
+    # Build the list of directories to inspect: cwd always, git root when different.
+    set -l check_dirs (pwd)
+    set -l git_root (git rev-parse --show-toplevel 2>/dev/null)
+    if test -n "$git_root" -a "$git_root" != (pwd)
+        set check_dirs $check_dirs $git_root
+    end
+
+    # Anchor for relative display: git root when available, otherwise cwd.
+    set -l anchor $git_root
+    test -z "$anchor" && set anchor (pwd)
+
+    for dir in $check_dirs
+        if not test -e "$dir/CLAUDE.md"
+            if test -f "$dir/AGENTS.md"
+                ln -s AGENTS.md "$dir/CLAUDE.md"
+                set -l prefix ""
+                if test "$dir" != "$anchor"
+                    set prefix (string replace "$anchor/" "" "$dir")/
+                end
+                set -l msg (string join "" "→ Linked " $prefix "CLAUDE.md → " $prefix "AGENTS.md")
+                echo $c_ok$msg$c_reset >&2
+            end
+        end
+    end
+
+    command claude $argv
+end