feat: Add comprehensive Makefile for testing and validation

Add Makefile adapted from chime.el with targets for:

Testing:
- make test              - Run all tests (unit + integration)
- make test-unit         - Run unit tests only
- make test-integration  - Run integration tests only
- make test-file FILE=<filename>  - Run specific test file
- make test-name TEST=<pattern>   - Run tests matching pattern

Validation:
- make validate-parens   - Check for unbalanced parentheses
- make validate-modules  - Load all modules to verify compilation
- make compile           - Byte-compile all modules
- make lint              - Run checkdoc, package-lint, elisp-lint

Utilities:
- make profile           - Profile Emacs startup
- make clean             - Remove test artifacts and compiled files
- make clean-compiled    - Remove .elc/.eln files only
- make clean-tests       - Remove test artifacts only
- make reset             - Reset to first launch (destructive!)

Default target is 'make help' which displays all available targets.

Inline scripts from scripts/ directory:
- delete-elisp-compiled-files.sh → make clean-compiled
- profile-dotemacs.sh → make profile
- reset-to-first-launch.sh → make reset

Delete inlined scripts to reduce duplication.

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