Catches up `docs/CONFIGURATION.md` with the v0.8.8 polish stack so
operators have one source of truth for the new surfaces:
* `NO_ANIMATIONS` env override (#450) joins the existing
environment-variable list, with a cross-reference to
`docs/ACCESSIBILITY.md`.
* New `### Instruction sources` section documents the
`instructions = [...]` config field (#454): expansion rules,
100 KiB per-file cap with `[…elided]` marker, missing-file
warning behavior, and the project-wholesale-replaces-user
override semantics.
* New `### /hooks listing` section documents the read-only
slash command (#460 MVP) so users know how to introspect
configured lifecycle hooks without `cat`-ing config.toml.
* New `### Composer stash` section documents Ctrl+S +
`/stash list|pop|clear` (#440) including the 200-entry cap
and multiline preservation.
Pure documentation; no code changes. Existing prompt-stability
and config-loading tests are unaffected.
Hunter Bown
5627d6535b