Adopts the sibling wave pattern (alkssh/alkgit) over
decompose-everything-upfront: decompose a wave, implement it, review
gate, decompose the next wave.
Scope authority: v0.1.0 publishes the shared text-generation core
(ADR-001) proven fit for ssr-html via consumer-shaped fixtures through
the public API (ADR-008 machinery equality). Engine-owned template
sets stay out (all three queued targets are OQ-gated); alktype leaves
the dep tree until the bast-codegen set activates.
Waves: 1 core foundations, 2 consumer-shaped proofs + conformance
battery, 3 validation & release (pure-review gate then publish).
Verification: taskgraph validate (14 tasks), em-dash grep clean