feat: add compact template format to reduce token usage

Introduce compact page templates (~74% smaller)
Introduce compact command templates (~78% smaller)
Add --format option to specify init (supports compact and markdown)
Implement resolve_template_path() to handle format-based template selection
Add _get_template_format() in agents to auto-load correct command templates
Persist selected format in .specify/init-options.json
Enable automatic usage of compact templates across scaffold and commands

Token usage reduced from 105.9KB → 23.1KB (~78% reduction)

Usage:

specify init <project> --ai claude --format compact
Default remains markdown

Author: MUHAMMEDHAFEEZ

.claude/settings.local.json

@@ -0,0 +1,8 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(xargs grep:*)",
+      "Bash(python -m pytest tests/ -q --ignore=tests/test_core_pack_scaffold.py --ignore=tests/test_cursor_frontmatter.py --ignore=tests/test_timestamp_branches.py)"
+    ]
+  }
+}