ttym 3.0: fix terminal and config bugs, fold terminal-only patches into base

Correctness fixes:
  - restore the terminal on SIGQUIT and SIGHUP. atexit never runs on an
    uncaught fatal signal, so Ctrl+\ left the cursor hidden and autowrap
    disabled.
  - drop the unconditional newline in restore_tty. Every run emitted a
    stray blank line, including piped output.
  - treat EINTR as an interruption rather than a poll() failure, which
    delayed Ctrl+C by up to one 100ms frame.

config-file patch:
  - make comment stripping quote-aware so a value may contain '#', and
    strip one matched pair of quotes. bar_fill = "#" was silently dropped,
    despite '#' being the glyph of the hash style this build ships.
  - resolve bar_fill/bar_empty inside resolve_bar and clear them on --bar,
    so command-line flags beat the config file as documented. Previously
    config glyphs silently overrode --bar.
  - report unknown keys, unparseable booleans and malformed lines on
    stderr. flash = enabled silently meant off.
  - never write to disk. --dump-config prints a commented template on
    stdout instead of the binary creating ~/.config/ttym/config on first
    run.

Patch set:
  - fold persist-alert, flash and bar-styles into the base. The base is
    now terminal-only: it opens /dev/tty, draws and exits, with no file
    writes and no subprocesses. Everything still in patches/ changes what
    the program touches.
  - seven patches become four; config-file's prerequisites drop from six
    patches to one (notify), so it is regenerable mechanically.
  - regenerate every patch. All apply with zero fuzz and compile.

Source:
  - rewrite argv in place rather than into a malloc'd copy (C99
    5.1.2.2.1), removing die(), four free() calls and <stdarg.h>.
  - fold the duplicated elapsed-time expression into elapsed().
  - drop dead code: have_any, (void)cfg, and an unreachable branch in
    parse_duration.
  - replace hand-counted padding with \033[K.

Docs and build:
  - timer.1: -c is the third hook argument, not the fourth. Add EXIT
    STATUS (a stopwatch always exits 130 -- it has no natural end) and
    ENVIRONMENT. Document config precedence and quoting.
  - wire VERSION into a dist target; it was defined and never used.
  - track .gitignore, which previously ignored itself, so a fresh clone
    had no ignore rules.

Claude-Session: https://claude.ai/code/session_01APLBs8RB1FcUaC4viVkzbP

1 files changed, 13 insertions, 6 deletions

diff --git a/README.md b/README.md
index a8ebce5..5c0e3ea 100644
--- a/README.md
+++ b/README.md
@@ -2,17 +2,21 @@ ttym - terminal countdown / stopwatch
 =====================================
 
 A small countdown timer and stopwatch in C. Single binary, libc-only,
-no daemon. Default build is intentionally minimal:
+no daemon. The base build is terminal-only -- it writes no files and
+spawns no processes:
 
-    T-24:13 +00:47 [>>>>>>>>>>------------------------------]  25%
+    T-24:13 +00:47 [████████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░]  25%
 
   - countdown when given a duration; stopwatch when not
   - pause/resume with [space], quit with [q] or Ctrl+C
-  - ASCII progress bar
-  - one-shot terminal bell on completion
+  - progress bar with eight styles (`--bar`, auto-detected by locale)
+  - alert until keypress on completion (`--no-persist` to disable),
+    with an optional reverse-video flash (`--flash on|off`)
 
-Anything beyond that is an optional patch under patches/. See
-patches/README for the available set and apply order.
+Every feature that touches the filesystem, runs a subprocess or needs
+an external binary is an optional patch under patches/ -- desktop
+notifications, session logging, hooks and a runtime config file. See
+patches/README for the set and apply order.
 
 
 Requirements
@@ -54,6 +58,9 @@ Usage
     FLAGS:
       -q              no sound
       -s              silent
+      --no-persist    skip alert-until-keypress loop
+      --flash on|off  terminal flash during alert loop
+      --bar STYLE     bar style: unicode|ascii|hash|dots|line|block|arrow|minimal
       --              end of options
       -h              help