perf: DEFLATE (puff) + -no-pie -> OF binary 879 KB -> 662 KB (-25%)

Two size wins:

- Replace the home-grown LZSS (2.0x) with DEFLATE: mktext gzips the text and
  strips the gzip container to a raw DEFLATE stream; clectio decompresses it
  with puff, Mark Adler's public-domain reference inflate (~200 lines, verified
  byte-identical to gunzip on the OF/EF text, repetitive, random and empty
  inputs). Text blob 671 KB -> 492 KB (OF), 164 KB -> 132 KB (EF), 2.7x.

- Build with -no-pie: clectio is a local CLI reading static embedded data with
  no attack surface, so it needs no PIE/ASLR. The linker then bakes the string-
  table pointers in at link time instead of emitting ~57 KB of runtime
  relocations.

Net: OF 879 -> 662 KB, EF 266 -> 214 KB. Verified byte-identical to lectio.
The default build still needs only a compiler + libc; a CORPUS= rebuild now
also needs gzip. lz.h removed.

Claude-Session: https://claude.ai/code/session_01S1CD1u3tgSS4xNu6WHfp5a

1 files changed, 6 insertions, 5 deletions

diff --git a/README.md b/README.md
index 2852836..e6d0556 100644
--- a/README.md
+++ b/README.md
@@ -41,8 +41,9 @@ chapter/verse numbering:
     make CORPUS=/path/to/mybible.tsv
 
 clectio compiles in only the ~12000 verses the lectionary actually cites, so the
-binary stays around 1 MiB whatever the Bible. A verse the corpus lacks prints
-blank; it never fails the day.
+binary stays well under 1 MiB whatever the Bible. A verse the corpus lacks prints
+blank; it never fails the day. (The default build needs only a compiler; a
+`CORPUS=` rebuild also needs `gzip`, which `mktext` uses to pack the text.)
 
 ## Coverage
 
@@ -53,11 +54,11 @@ guessed. To extend it, regenerate `gen/` with lectio's `clectio-gen`.
 
     clectio.c        the program: date -> table lookup -> print
     config.def.h     compile-time configuration
-    lz.h             a tiny LZSS codec (keeps the compiled text small)
-    mktext.c         build tool: resolve verse keys against a corpus, pack the text
+    puff.c/.h        DEFLATE decompressor (Mark Adler's puff, public domain)
+    mktext.c         build tool: resolve verse keys against a corpus, gzip-pack the text
     bin2h.c          build tool: embed the packed text as C
     gen/             generated, corpus-independent data (calendar + citations)
-    text_of.lz       the default Vulgate text, packed (one per form)
+    text_of.lz       the default Vulgate text, DEFLATE-packed (one per form)
 
 ## Licence