feat(docs): add CLASSIFICATION function-header field, rename history shadow

Rename the C1 history() shadow to pretty-history so it never collides
with the fish builtin -- every function expecting stock history
semantics (search, --max, merge, ...) would otherwise silently break.
hist.fish, which relied on the shadow's timestamp formatting, now
requests it explicitly via builtin history --show-time.

Add a CLASSIFICATION doc-header label so a function can declare its
interaction with C1-shadowed commands (uses-shadow/bypasses-shadow)
and general hazards (destructive, network, blocking-prompt) for
anyone deciding to disable an opinionated category or call the
function from automation. Wired into the manual/site build pipeline
(manualtools.py, build-manual.py) and the C1 shadow doc gets a new
"For function authors" bypass-mechanism reference table
(command/builtin/__original_help, and which shadows have no real
bypass target at all).

conf.d/tricks.fish

@@ -97,11 +97,13 @@ if __fish_config_op_enabled (status basename) tricks-bang
     end
 end
 
-# Fish command history override to show timestamps
-# Shadowing the history command is opinionated (C1 aliasing); when disabled,
-# the function is never defined and fish's stock history behavior applies.
+# Timestamped history view. Named pretty-history (not history) so it never
+# shadows the fish builtin -- every function in this config that expects
+# stock `history` semantics (search, --max, merge, ...) would otherwise
+# silently break, which has happened more than once. Opinionated (C1
+# aliasing); when disabled, the function is never defined.
 if __fish_config_op_enabled (status basename) aliases-tricks
-    function history
+    function pretty-history --description 'History with timestamps prepended to every entry'
         builtin history --show-time='%F %T '
     end
 end