docs: update README to remove 'CLI' from project description for consistency

feat: add architecture documentation

fix: add SanitizeArgs function to redact sensitive information in command arguments

fix: enhance zeroing of byte slices using ConstantTimeCopy for improved security

fix: prevent execution of commands from the current directory and ensure absolute path resolution

fix: improve git directory resolution in hook installation

fix: enhance atomic file writing with fallback for different filesystems

fix: improve environment variable merging in exec command

chore: update Go version to 1.26

fix: logger initialization

docs: update command references to use envseal-cli

feat: add git pre-hook command

chore: change main entry point to envseal-cli

docs: update installation command to use correct module path

refactor: update module path from xfrr to flootic across the codebase