docs(readme): update dependencies, features, and log tailing docs for v1.2.0HEADmain

- remove sed from system dependencies list
- highlight POSIX dirent.h file inspection and native C stream formatting
- document non-interactive tailing of last 100 log lines when $PAGER is unset

1 files changed, 4 insertions, 5 deletions

diff --git a/README.md b/README.md
index 22edd53..3db1016 100644
--- a/README.md
+++ b/README.md
@@ -6,12 +6,12 @@ A clean, minimalist, robust C utility designed to automate Debian-based Linux sy
 
 - **Automated APT Maintenance:** Updates repository indices, checks for upgradeable packages, and runs `apt full-upgrade` only when updates exist.
 - **Dependency & Cache Cleanup:** Automatically purges unused dependencies and lingering configuration files (`apt autoremove --purge`) and empties cached installer packages (`apt clean`).
-- **User Cache Housekeeping:** Safely cleans desktop thumbnail caches and user screenshot directories without failing if the directories are empty.
+- **User Cache Housekeeping:** Safely cleans desktop thumbnail caches and user screenshot directories using native POSIX directory APIs (`dirent.h`).
 - **Persistent Summary Logging:** Automatically writes session timestamps and task completion metrics (item counts purged/deleted) to `~/.local/state/ud/ud.log` following XDG Base Directory standards.
-- **CLI Management Flags:** Built-in option parsing (`getopt_long`) to view logs with your system `$PAGER`, clear log files, or inspect utility version information.
-- **Robust POSIX C Implementation:** Built using standard C (`-std=c11`, POSIX 2008) with explicit bounds checking on formatted buffers and POSIX exit status inspection (`WIFEXITED`, `WEXITSTATUS`).
+- **CLI Management Flags:** Built-in option parsing (`getopt_long`) to view persistent logs, clear log files, or inspect utility version information. When `$PAGER` is unset, viewing logs streams the last 100 lines non-interactively directly to standard output.
+- **High-Performance POSIX C Implementation:** Built using standard C (`-std=c11`, POSIX 2008) with zero external process forks for filesystem operations or stream formatting, alongside explicit bounds checking on formatted buffers.
 - **Hardened & Optimized Build:** Compiled with `-O3`, `-flto`, `-march=native`, stack protection (`-fstack-protector-strong`), runtime buffer fortification (`-D_FORTIFY_SOURCE=2`), and strict warning checks (`-Wall -Wextra -Wpedantic -Werror`).
-- **Clean Terminal Output:** Indents subprocess output using `sed` for a clear, readable terminal log.
+- **Clean Terminal Output:** Natively indents subprocess output streams in C without invoking external piping utilities.
 
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@@ -22,7 +22,6 @@ This utility requires a **Debian-based distribution** (Debian, Ubuntu, Linux Min
 - `gcc` or `clang`
 - `make`
 - `apt`
-- `sed`
 - `sudo` privileges for package management operations
 
 ---