v0.17.7 — Codegen and delivery invocation documented

Documentation

• How to invoke the codegen and delivery paths is now written down. The codegen skills were
  catalogued but never explained: nothing stated that they sit outside /architect:pipeline, in what
  order they chain, or what each one needs before it can run — and the whole backlog-delivery family
  (export-backlog, deliver-backlog, implement-backlog, review-issue, merge-issue) was absent
  from README.md and docs/skill-reference* altogether, though CLAUDE.md documents it.
  • README.md: Quick Start gains the codegen and delivery entry points; a new Code Generation &
    Delivery workflow section lays out the four paths and the distinction that matters — path A
    emits a disposable scaffold under generated/, path B writes merge-bound code into the project's
    real source tree; new Backlog Delivery command table; the Implementation & Codegen table gains
    a Requires column; the dependency graph now explains the manual extension tier; new Dependency
    Versions section covering the v0.17.6 flags and the project-level option.
  • docs/getting-started.md / _ja.md: new §5 Generating Code, §6 Delivering Code Through a
    Backlog, §7 Choosing Dependency Versions (the ScalarDB and migration sections renumber to 8/9).
  • docs/skill-reference.md / _ja.md: the Implementation table gains a Requires column and the
    manual-tier note; new Backlog Delivery section with per-skill models and roles.

Fixed

• CLAUDE.md claimed the manual extension tier could be invoked "via /architect:start". It cannot:
  start executes only the phases in skill-dependencies.yaml, and references no codegen skill.
  Corrected, with pointers to the new invocation chains.