Drop the TODO.md section numbers from 26 files

Eighty-five comments cited section numbers -- 1.1, 2.2.6, 3.6 -- from a
numbering the file had already abandoned before the move to the tracker. They
label completed work, so the pointer was the only wrong part.

The citation is removed and the sentence kept, which is what issue #27
recommended: these are labels, not references, and a label carrying a
version-dependent pointer goes stale again at the next reorganisation. Where a
pointer earns its place it names what actually holds the content now --
UPGRADING.md for the confirmed defects, libakerror #15 for the target
namespacing, issue #7 for the mutation survivors.

README.md and akstdlib.h sent readers to TODO.md for 'what is still open';
they name the tracker.

Verified: cmake --build build && ctest --test-dir build, 19/19.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>

tests/test_format.c

@@ -2,7 +2,7 @@
  * Formatted-output wrappers: aksl_printf / aksl_fprintf / aksl_snprintf and
  * their va_list forms.
  *
- * TODO.md section 1.3, now complete. Each happy path asserts both halves of the
+ * Formatted output, complete. Each happy path asserts both halves of the
  * contract -- the byte count handed back through *count and the text that
  * actually landed somewhere -- and every pointer argument is checked for its
  * NULL guard.
@@ -11,7 +11,7 @@
  * points at the formatted-output wrapper under test and not at the stream
  * wrappers, which tests/test_stream.c covers.
  *
- * aksl_sprintf is gone (TODO.md 2.2.4) and aksl_snprintf takes its place, so the
+ * aksl_sprintf is gone and aksl_snprintf takes its place, so the
  * destination-overflow case that could not previously be written is here: it is
  * AKERR_OUTOFBOUNDS, not the short success snprintf(3) would have reported.
  */
@@ -139,7 +139,7 @@ static int test_fprintf_writes_to_stream(void)
 /*
  * vfprintf on a stream opened "r" fails outright, so the wrapper reports the
  * errno it saw (EBADF on glibc). *count is 0 afterwards, not vfprintf's -1:
- * TODO.md 1.3 recorded the negative count as a contract gap, and this is the
+ * The wrapper plan recorded the negative count as a contract gap, and this is the
  * assertion that closes it.
  */
 static int test_fprintf_to_read_only_stream_reports_errno(void)
@@ -270,7 +270,7 @@ static int test_asprintf_allocates_to_fit(void)
 }
 
 /*
- * The va_list forms are what the variadic ones are built on, and TODO.md 3.1
+ * The va_list forms are what the variadic ones are built on, and the wrapper contract
  * wanted them exposed so consumers can write their own variadic wrappers. This
  * is a consumer doing exactly that.
  */
@@ -304,7 +304,7 @@ static int test_va_list_forms_are_usable_from_outside(void)
 }
 
 /*
- * Regression cover for the missing va_end (TODO.md 2.1.4). Nothing here can
+ * Regression cover for the missing va_end. Nothing here can
  * assert on register-save state directly; the point is to run the variadic
  * wrappers enough times, with enough arguments, that the sanitizer build has
  * something to trip over.