docs(rules): write this batch's rule files in English

[LeadcodeDev]

Every .md in this repository is English. Five rule files written or touched in
the current batch were French.

One of them was French because I translated it that way. The emitter rule
arrived in English from the implementation, and I rewrote it in French in #407,
reasoning that the eight most recently written rules were all French so the corpus
was trending that way. The sample was real and the conclusion was wrong — recency
in a corpus that is roughly half and half is not a style rule. That file is
restored to the text the implementation shipped with, whose content was never in
question (git show 5f935d2:…).

File
emitter-lifecycle.md	restored to the original English
burst.md, animations-compose.md, shatter.md	translated in full
continuous-presets.md, draw-progress-stroke.md	had an English body with a French section, or the reverse — now English throughout rather than bilingual

No content changes: same claims, same tables, same examples, same links. Checked
that every intra-rules/ link still resolves and that the SKILL.md index lines
(already English) still describe what the files say.

Not in this PR

The rest of the corpus is still mixed — roughly half the 80 rule files are French,
as is most of CLAUDE.md. Translating those is its own piece of work rather than a
side effect of this batch; say the word and I will do it as a separate pass.

Gate

cargo test --workspace 1807 passed (the docs are load-bearing for
audit_ws_k's README/manifest invariants).