Create .codeforge/ user customization directory (#33)

* Create .codeforge/ user customization directory

Centralizes all user-facing config files into .codeforge/, separating
user customization from .devcontainer/ framework internals. Adds
checksum-based modification detection so updates preserve user changes.

- Move config files from .devcontainer/config/defaults/ to .codeforge/config/
- Move file-manifest.json to .codeforge/
- Move terminal scripts to .codeforge/scripts/
- Add checksum-based sync (SHA-256) for --force and --reset
- Add auto-migration script for existing installations
- Add codeforge config apply CLI subcommand
- Add codeforge alias to setup-aliases.sh
- Update setup.sh with CODEFORGE_DIR env var and deprecation guard
- Update setup-config.sh to read from .codeforge/
- Bump version to 2.0.0
- Update all documentation and docs site references

* Fix review issues: corrupted checksums, var ordering, stale links

Review fixes from 4-agent code review:

- setup.js: Handle corrupted checksums JSON gracefully (try/catch)
- setup.js: Generate checksums from source, not destination on fresh install
- setup.js: Use regex with /g flag in expandVars for multiple occurrences
- setup.sh: Fix variable ordering — set CODEFORGE_DIR before CONFIG_SOURCE_DIR
- setup.sh: Unset CONFIG_SOURCE_DIR after deprecation guard fires
- .gitignore: Remove duplicate .devcontainer/ un-ignore and stale config paths
- architecture.md: Add missing orchestrator-system-prompt.md and migration step
- README.md: Fix dead links to removed docs/ directory, point to docs site

* Fix semver sort in readChecksums and validate overwrite field

- readChecksums: Sort version filenames by numeric semver components
  instead of lexicographic order (1.10.0 now correctly sorts after 1.9.0)
- configApply: Validate overwrite field against known values (always,
  if-changed, never) and warn on unrecognized values

* Remove dead .codeforge-preserve file

The checksum system in syncCodeforgeDirectory automatically preserves
user-modified files. This file was never read by any code — removing
to avoid implying functionality that doesn't exist.

* Fix CodeRabbit review issues: path traversal, URLs, docs, setup.sh

- Add path traversal validation in configApply() for source and
  destination paths in file-manifest.json
- Use default-assignment for CODEFORGE_DIR in deprecation guard
- Replace old GitHub Pages URLs with custom domain
  (codeforge.core-directive.com)
- Add .checksums/ and .markers/ to architecture docs tree
- Clarify "How to Reset" section in troubleshooting docs
- Fix "merged" → "migrated content from" in changelog wording

* Fix biome formatting in setup.js path traversal validation

---------

Co-authored-by: AnExiledDev <AnExiledDev@users.noreply.github.com>

Author: AnExiledDev

…nfig/defaults/ccstatusline-settings.json …eforge/config/ccstatusline-settings.json.devcontainer/config/defaults/ccstatusline-settings.json renamed to .codeforge/config/ccstatusline-settings.json .devcontainer/config/defaults/ccstatusline-settings.json renamed to .codeforge/config/ccstatusline-settings.json

@@ -1,61 +1,61 @@
 [
 	{
-		"src": "defaults/settings.json",
+		"src": "config/settings.json",
 		"dest": "${CLAUDE_CONFIG_DIR}",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/keybindings.json",
+		"src": "config/keybindings.json",
 		"dest": "${CLAUDE_CONFIG_DIR}",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/main-system-prompt.md",
+		"src": "config/main-system-prompt.md",
 		"dest": "${CLAUDE_CONFIG_DIR}",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/rules/spec-workflow.md",
+		"src": "config/rules/spec-workflow.md",
 		"dest": "${CLAUDE_CONFIG_DIR}/rules",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/rules/workspace-scope.md",
+		"src": "config/rules/workspace-scope.md",
 		"dest": "${CLAUDE_CONFIG_DIR}/rules",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/rules/session-search.md",
+		"src": "config/rules/session-search.md",
 		"dest": "${CLAUDE_CONFIG_DIR}/rules",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/writing-system-prompt.md",
+		"src": "config/writing-system-prompt.md",
 		"dest": "${CLAUDE_CONFIG_DIR}",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/orchestrator-system-prompt.md",
+		"src": "config/orchestrator-system-prompt.md",
 		"dest": "${CLAUDE_CONFIG_DIR}",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/ccstatusline-settings.json",
+		"src": "config/ccstatusline-settings.json",
 		"dest": "${HOME}/.config/ccstatusline",
 		"destFilename": "settings.json",
 		"enabled": true,
 		"overwrite": "if-changed"
 	},
 	{
-		"src": "defaults/ccstatusline-settings.json",
+		"src": "config/ccstatusline-settings.json",
 		"dest": "/usr/local/share/ccstatusline",
 		"destFilename": "settings.template.json",
 		"enabled": true,