Add the cascade cross-repository wave machinery

[alexander-yevsyukov]

Introduces cascade, the machinery for propagating a change across the Spine
SDK repositories in dependency order, and the documentation around it. Proven
end to end: the cascade-refresh-2cd0e3b wave ran on it, publishing 15
repositories and closing with config#759.

What lands

cascade	~1600-line driver: graph, plan, status, next, prep, build, ship, refresh, park, resume, await, close
docs/dependency-graph.md	The canonical build order as a Mermaid graph plus per-repo metadata, generated and re-verified by cascade graph
docs/rollout/rebuild.md	Operator playbook
docs/rollout/rebuild-pr-body.md	PR body applied to each wave PR
.agents/memory/, .agents/tasks/	Team memory and the wave's task record
submodules	BuildSpeed, delivery-server, documentation, dokka-tools added; all pointers moved to the wave's merged masters

Design

Deterministic mechanics live in the script; judgement steps — build breakage,
pre-PR review, version edge cases — are handed back via exit code 3 with a
resume command. State is derived, never remembered: status re-proves every
fact from the registry, gh, and the git tree, so a recorded built is
demoted the moment a later commit lands. Interrupt anything and re-run it.

Two rules the wave exists to enforce:

• PR creation is gated on the registry, not on merge. A downstream PR opens
  only once every version it pins is provably published — CI resolves from the
  registry, not from Maven Local.
• Published-floor constants advance only at close. versionForBuildScript,
  dogfoodingVersion and the fallback* pair feed buildscript and
  pluginManagement classpaths that cannot see Maven Local, so during a wave
  they must keep pointing at the previous published generation.

Review fixes in 7c01d61

Pin-file handling. Three defects were found in cmd_close, then the same
shape was found still live in cmd_prep and derive_state. In cmd_prep it
was worse: the match was unanchored, so on ToolBase.kt a head -1 could take
the nested JavadocFilter.version — a different artifact,
spine-javadoc-filter — and the verification counted matches anywhere in the
file, so a run that clobbered the wrong constant still reported success. All
three now share anchored helpers accepting const val, private const val and
override val.

Silent aborts. A grep matching nothing exits 1; under pipefail that
killed the caller before its own diagnostic could run. cmd_prep died without
printing "constant not found", and version_of before die "cannot read".

Permissions. allow carried Bash(git push:*), which matches any
arguments, while deny named no force variant — so git push --force was
reachable. safety-rules.md requires force-push, git tag, git rebase,
gh release create and gh pr merge to stay per-action even under a grant.
Force-push is now denied, git tag asks; the other three were already covered.

For the reviewer

• cascade never force-pushes, never touches master directly, and contains no
  gh pr merge, git rebase, or history rewriting. Branch names are always
  cascade-{refresh,ripple,retarget}-*.
• cmd_build and cmd_ship deliberately re-implement the pre-PR and
  version-bump gates internally. Bash(./cascade:*) is one allow-listed
  invocation, so the PreToolUse hooks — which pattern-match the literal command
  text — never see the gh pr create and ./gradlew calls made inside. The
  secret-scan protection is unaffected, being a real git pre-commit hook.
• Every sed edit to a pin file is anchored, then verified, and reverts the
  file on mismatch.
• Not addressed, deliberately: some Markdown table rows exceed the 100-column
  limit because of cell-alignment padding. Cosmetic, and de-padding would churn
  every row; happy to do it if preferred.

Verification

• The wave itself: 15 repositories published, closing vector merged as
  config#759.
• bash -n clean; ./cascade status and ./cascade close re-run green and
  idempotent after the refactor.
• Pin helpers unit-tested against the real files: ToolBase.version reads
  .422 and not the nested .75; private const val and override val both
  read; a missing constant returns empty without aborting; a write touches only
  the intended line.
• review-docs — APPROVE WITH CHANGES (accuracy items applied).
• spine-code-review — REQUEST CHANGES; all three Must-fix items applied above.

🤖 Generated with Claude Code

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-03T16:59:35.796660Z	7c01d61	PR opened

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🟡 Changes recommended

There is at least one confirmed functional issue in cascade (ripple slug/version handling) plus smaller correctness/clarity issues that should be addressed before approval.

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Pull request overview

Adds the new cascade driver to orchestrate deterministic cross-repository “waves” across Spine SDK submodules (plan/status/next/prep/build/ship/close), alongside documentation that defines and explains the canonical dependency/build order contract used to sequence those waves.

Changes:

• Introduce cascade (bash) with wave planning, state derivation, gating, and PR automation.
• Add/extend documentation for the dependency graph contract and the operator playbook for rebuild waves.
• Update repo layout docs and submodule configuration to reflect new participating repositories/tooling.

File summaries

File	Description
README.md	Links repository layout to the canonical dependency/build-order contract and updates submodule tables.
docs/rollout/rebuild.md	Operator playbook describing how to run rebuild waves using cascade.
docs/rollout/rebuild-pr-body.md	Standard PR body template used when cascade ship opens per-repo PRs.
docs/project.md	Documents rebuild waves as a cross-repository workflow and links to cascade + the dependency graph.
docs/dependency-graph.md	Canonical, reviewed build order + dependency diagrams and per-repo metadata consumed by cascade.
cascade	New wave orchestration script implementing graph verification, planning, state derivation, and per-repo steps.
.gitmodules	Adds new submodules (e.g., delivery-server, BuildSpeed, documentation, dokka-tools).
.claude/settings.json	Updates tool/skill permission configuration for running cascade (skipped per repo guidelines).
.agents/tasks/cascade.md	Wave/cascade design and task record (skipped per repo guidelines).
.agents/tasks/cascade-refresh-2cd0e3b.md	Recorded wave task state (skipped per repo guidelines).
.agents/tasks/cascade-refresh-2cd0e3b.json	Machine manifest for a wave (skipped per repo guidelines).
.agents/memory/MEMORY.md	Team memory index (skipped per repo guidelines).
.agents/memory/fix-deprecations-in-touched-code.md	Team guidance on deprecation cleanup (skipped per repo guidelines).

Review details

Suppressed comments (1)

cascade:853

• plan --kind ripple --seed <repo> allows omitting @<version>, but the slug is still built from seed_ver (cascade-ripple-$seed-${seed_ver##*.}), producing a trailing - and not freezing the seed version at plan time. This can lead to ambiguous/non-deterministic wave identifiers.

    case "$kind" in refresh|ripple|retarget) ;; *) usage_plan ;; esac
    [ "$kind" = ripple ] && [ -z "$seed" ] && usage_plan
    [ "$kind" = retarget ] && [ -z "$target" ] && usage_plan

    "$0" graph --check

    # Trigger + slug.
    local cfg_sha slug
    git -C "$SUMMIT/config" fetch --quiet origin "$BASE" 2>/dev/null || true
    cfg_sha="$(git -C "$SUMMIT/config" rev-parse "origin/$BASE" 2>/dev/null \
               || git -C "$SUMMIT/config" rev-parse HEAD)"
    case "$kind" in
        refresh)  slug="cascade-refresh-$(echo "$cfg_sha" | cut -c1-7)" ;;
        ripple)   slug="cascade-ripple-$seed-${seed_ver##*.}" ;;
        retarget) slug="cascade-retarget-$target" ;;
    esac

• Files reviewed: 33/33 changed files
• Comments generated: 2
• Review effort level: Lite

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