refactor!: collapse six filter defcustoms into include/exclude alists

Six per-axis filter variables (keyword/tags/predicate × whitelist/blacklist)
were carrying parallel structure for what's really one decision: include
events that look like X, exclude events that look like Y. I merged them
into two alists, `chime-include-filters' and `chime-exclude-filters', each
keyed by axis (`keywords', `tags', `predicates').

Default for `chime-exclude-filters' keeps the same out-of-the-box
behavior — done items and declined Google Calendar invites stay
filtered:

  ((predicates . (chime-done-keywords-predicate
                  chime-declined-events-predicate)))

Implementation: one shared `chime--filter-predicates' helper that walks
the alist and emits a marker-taking predicate per non-empty axis. The
public callers — now `chime--apply-include-filters' and
`chime--apply-exclude-filters' — wrap that helper with
`-orfn'-then-`-filter' and `-orfn'-then-`-remove' respectively. The
async-environment regex injection list shrank from six names to two,
and the debug config dump in chime-debug.el follows.

The terminology shift (whitelist/blacklist → include/exclude) drops
loaded language for descriptive intent. The internal helpers and the
public function names all moved together.

Tests: 700-ish lines across five test files (test-chime-apply-whitelist,
test-chime-apply-blacklist, test-chime-whitelist-blacklist-conflicts,
test-chime-environment-regex, test-chime-declined-events-predicate)
were rewritten to bind the new alists. The dedup-conflict tests still
exercise the same precedence rule (exclude wins on overlap). README's
filtering section was rewritten end-to-end with new examples.

Migration:
  (setq chime-keyword-whitelist '("TODO"))
  ;; ->
  (setq chime-include-filters '((keywords . ("TODO"))))

  (setq chime-predicate-blacklist '(my-pred))
  ;; ->
  (setq chime-exclude-filters '((predicates . (my-pred))))

This brings the consolidation pass to 37 -> 29 defcustoms, the target
from .ai/settings-consolidation.org.

1 files changed, 7 insertions, 5 deletions

diff --git a/tests/test-chime-declined-events-predicate.el b/tests/test-chime-declined-events-predicate.el
index ca25faa..5f8c4b8 100644
--- a/tests/test-chime-declined-events-predicate.el
+++ b/tests/test-chime-declined-events-predicate.el
@@ -144,13 +144,15 @@ than treating it as declined."
     (let ((marker (point-marker)))
       (should-not (chime-declined-events-predicate marker)))))
 
-;;;; Integration with the default predicate-blacklist
+;;;; Integration with the default exclude filters
 
-(ert-deftest test-chime-declined-events-predicate-on-default-blacklist ()
-  "Normal: the predicate ships in the default `chime-predicate-blacklist'
-so out-of-the-box installs hide declined events without extra config."
+(ert-deftest test-chime-declined-events-predicate-on-default-exclude-filters ()
+  "Normal: the predicate ships in the default `chime-exclude-filters'
+under the predicates key, so out-of-the-box installs hide declined
+events without extra config."
   (should (memq 'chime-declined-events-predicate
-                (default-value 'chime-predicate-blacklist))))
+                (alist-get 'predicates
+                           (default-value 'chime-exclude-filters)))))
 
 (provide 'test-chime-declined-events-predicate)
 ;;; test-chime-declined-events-predicate.el ends here