Bumps `@version` in `mix.exs` and the compiler's second carrier,
`@compiler_version` in `lib/statifier_blocks/compiler.ex`, to 0.33.0, and
the README install pin to `~> 0.33.0`. The compiler version moves on every
release because it is stamped into every compilation record, so a stored
compiled chart recompiles under the new stamp.

Promotes the eight `changelog.d/` fragments into a `## [0.33.0]` section
dated with the local date, grouped by heading and in fragment-name order
within each, and deletes them: sb-9ng8, sb-grbs, sb-kndj, sb-m89g,
sb-opa4, sb-uc5p, sb-vkyz, sb-z078. Every bullet is carried over byte for
byte; the lead paragraph and the link reference are the only prose
written here.

A minor, not a patch: a new `accepts` envelope key and two new public
modules, `StatifierBlocks.Publish` and `StatifierBlocks.Graph`, with no
existing signature changed. The lead paragraph carries the upgrade note
for a host that stores documents.

Gate: full mix quality green on this staged tree (3,489 of 3,489 tests,
95.1% coverage, dialyzer clean, ADR cites green); mix hex.build builds
statifier_blocks 0.33.0.

No tag, no publish: both are the operator's.

Refs: sb-grbs