feat: add chezmoi-development skill and fix .claude directory management

- Add comprehensive chezmoi-development skill with documentation for .chezmoidata and modify scripts
- Replace dot_claude/settings.json with run_onchange_after_update-claude-settings.sh.tmpl
- Add .claude to .chezmoiignore to prevent management conflicts with symlinks
- Remove run_before_00_remove-claude-symlink.sh.tmpl that was breaking symlinks
- Configure fx/cc marketplace and enable fx-dev@fx-cc plugin by default
- Improve install.sh to detect and use local repository for testing
- Clear chezmoi state database and use --force flag to avoid prompts
- Suppress confusing "Cloning into" message when using local repository

This approach allows .claude to remain a symlink in Coder workspaces while still applying
settings updates via the run_onchange_after script, which works with both directories and symlinks.

Author: fx

.chezmoidata/claude.yaml

@@ -0,0 +1,16 @@
+---
+# Claude Code marketplace configuration
+# This data is merged into ~/.claude/settings.json via modify_ script
+
+marketplace:
+  extraKnownMarketplaces:
+    fx-cc:
+      source:
+        source: git
+        url: git@github.com:fx/cc.git
+
+settings:
+  includeCoAuthoredBy: false
+  enableAllProjectMcpServers: true
+  enabledPlugins:
+    fx-dev@fx-cc: true

.chezmoiignore

@@ -11,4 +11,8 @@ test-*.sh
 *.bak
 
 # Note: shared directory stays in source for symlink targets, not installed to home
-shared/
+shared/
+
+# .claude directory is managed by run_onchange_after_update-claude-settings.sh script
+# Not by chezmoi's file management (allows symlinks to work in Coder)
+.claude

.chezmoiscripts/run_before_00_remove-claude-symlink.sh.tmpl

@@ -0,0 +1,36 @@
+#!/bin/bash
+# Update ~/.claude/settings.json with marketplace configuration
+# Works with both real directories and symlinks
+
+{{ if .include_defaults -}}
+set -e
+
+# Ensure ~/.claude exists (as directory or symlink)
+if [ ! -e "$HOME/.claude" ]; then
+    mkdir -p "$HOME/.claude"
+fi
+
+SETTINGS_FILE="$HOME/.claude/settings.json"
+
+# Read existing settings or start with empty object
+if [ -f "$SETTINGS_FILE" ]; then
+    existing=$(cat "$SETTINGS_FILE")
+else
+    existing='{}'
+fi
+
+# Our required settings from .chezmoidata/claude.yaml
+required_settings='{{ .settings | toJson }}'
+marketplace_config='{{ .marketplace | toJson }}'
+
+# Merge: existing settings + our required settings + marketplace config
+# Our settings take precedence (using * operator for recursive merge)
+result=$(echo "$existing" | jq --argjson required "$required_settings" \
+                                --argjson marketplace "$marketplace_config" \
+                                '. * $required * $marketplace')
+
+# Write the merged result
+echo "$result" > "$SETTINGS_FILE"
+
+echo "✓ Updated $SETTINGS_FILE"
+{{ end -}}