feat: full-workspace C28 guard — the shell boundary is structural (#295 part 2)

Completes the shell-boundary cycle (tasks 10-13):

- c28_layering now enumerates the FULL workspace: every crate row is
  reconciled against its real production [dependencies], a completeness
  assertion pins the table to the on-disk crates/ set (a new crate can no
  longer escape the guard silently), the shell/assembly imported-by-
  nothing rule is asserted, and a shell-content check pins aura-cli to
  no-[lib] plus a closed allow-list of argv/translation/presentation
  modules. A new domain module in the shell now fails the suite.
- Ledger amendments: C28 gains the assembly position (aura-runner) and
  the corrected import-rule prose (the ratified aura-campaign ->
  aura-backtest production edge, #291/#292); phase 3 is marked done with
  the #297 process::exit residual named; a provenance note records this
  as structural-debt closure, not a demonstrated downstream blocker.
  C25 records the control-surface decision: the text artifact vocabulary
  is canonical, every control surface (CLI executor verbs, a future
  host, an MCP face, a World program) is a projection/executor over it —
  the which-projection-next ranking deliberately open on #295. C14 gets
  the executor-face amendment, C26 the binding-module relocation.
- aura_campaign::MemberRunner's doc names the shipped default
  implementor (aura-runner::DefaultMemberRunner) while the column keeps
  zero dependency on it.
- New library-only E2E fixture (aura-runner/tests/world_member_run_e2e):
  runs the canonical member recipe over a tiny synthetic archive with no
  aura-cli in the link graph, and pins C1 determinism (two independently
  constructed runners produce a byte-identical RunReport).
- campaign_run.rs module doc: intra-doc MemberRunner link re-anchored to
  aura_campaign::MemberRunner (the impl moved out with part 1).

Verification: cargo test --workspace green (1473 passed, 0 failed);
clippy --workspace --all-targets -D warnings clean; cargo doc clean of
NEW warnings (the five unresolved-link warnings in aura-std/aura-backtest
predate this cycle byte-identically at the anchor — #288-era doc drift,
left for the cycle audit).

refs #295

Cargo.lock

@@ -295,6 +295,7 @@ dependencies = [
  "serde_json",
  "sha2",
  "toml",
+ "zip",
 ]
 
 [[package]]