Initial shared Copilot resources scaffold

config/copilot-cli/env.example.ps1

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+$env:COPILOT_RESOURCES_HOME = if ($env:COPILOT_RESOURCES_HOME) { $env:COPILOT_RESOURCES_HOME } else { Join-Path $HOME '.copilot-resources' }
+$env:COPILOT_HOME = if ($env:COPILOT_HOME) { $env:COPILOT_HOME } else { Join-Path $HOME '.copilot' }
+$env:COPILOT_CUSTOM_INSTRUCTIONS_DIRS = Join-Path $env:COPILOT_RESOURCES_HOME 'resources\instructions'

config/copilot-cli/env.example.sh

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+export COPILOT_RESOURCES_HOME="${COPILOT_RESOURCES_HOME:-$HOME/.copilot-resources}"
+export COPILOT_HOME="${COPILOT_HOME:-$HOME/.copilot}"
+export COPILOT_CUSTOM_INSTRUCTIONS_DIRS="${COPILOT_RESOURCES_HOME}/resources/instructions"

config/vscode/settings.template.jsonc

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+{
+  // Optional feature flags and direct-path discovery fallback.
+  // Most discovery is intended to work through the default paths linked by bootstrap.
+  "github.copilot.chat.cli.customAgents.enabled": true,
+  "chat.useCustomAgentHooks": true,
+  "chat.useAgentsMdFile": true,
+  "chat.useClaudeMdFile": true,
+  "chat.useCustomizationsInParentRepositories": true,
+
+  // Direct-path fallback configuration in case symlinked defaults are not preferred.
+  "chat.instructionsFilesLocations": {
+    "{{COPILOT_RESOURCES_HOME}}/resources/instructions": true,
+    "~/.claude/rules": true
+  },
+  "chat.agentFilesLocations": {
+    "{{COPILOT_RESOURCES_HOME}}/resources/agents": true,
+    "~/.copilot/agents": true
+  },
+  "chat.agentSkillsLocations": {
+    "{{COPILOT_RESOURCES_HOME}}/resources/skills": true
+  },
+  "chat.promptFilesLocations": {
+    "{{COPILOT_RESOURCES_HOME}}/resources/prompts": true
+  },
+  "chat.hookFilesLocations": {
+    "{{COPILOT_RESOURCES_HOME}}/resources/hooks": true,
+    "~/.claude/settings.json": true
+  }
+}