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.

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