fix: remove residual dead V-lang wiring (Justfile/CI/scripts/docs)

[hyperpolymath]

Summary

PR #66 (merged) removed only the V-lang CI jobs. The repo still had
live dangling V-lang references with no backing source — adapter/v/
was deleted in the prior 2026-04-12 V-lang sweep, and the real
REST/gRPC/GraphQL surface is the Elixir backend (elixir/,
Plug/Cowboy). No V port was ever needed. This PR finishes the
dead-leaf cleanup.

What was removed / fixed

Justfile

• Deleted the build-adapter recipe entirely.
• run / serve / install now use only the existing Elixir path; the
  dead V else fallback branches were dropped (no new behavior — the
  Elixir branch was already the preferred path). install no longer
  copies a non-existent V binary.
• heal: removed the git clone https://github.com/vlang/v + make +
  symlink block.
• doctor: dropped check_optional "V (vlang)" and the
  adapter/v/boj-server artefact check (now checks elixir/).
• matrix / tour / help-me: cosmetic V status echoes repointed to
  the Elixir reality. All recipes remain syntactically valid.

CI

• .github/workflows/lsp-dap-bsp.yml: deleted the adapter-check job
  (it ran v check; missed by PR fix(ci): remove banned V-language build from zig-test/e2e workflows #66) and removed it from the
  completeness job's needs: so the workflow stays valid.
• .github/workflows/e2e.yml: deleted the dead Build V adapter step
  (cd adapter/v && v -o boj-server .).

scripts / tests / docs

• tests/e2e_full.sh, tests/federation_multinode.sh: launch the
  Elixir backend (cd elixir && mix run --no-halt) instead of the
  non-existent adapter/v/boj-server.
• tests/aspect_tests.sh: removed the dead V-lang ABI-contract aspect
  and the V-file SPDX loop; cartridge-completeness check is now ABI+FFI;
  aspects renumbered consistently.
• scripts/boj-selinux-contexts.sh: removed the dead V binary fcontext
  rule; renumbered the remaining two steps.
• docs/RSR_OUTLINE.adoc, docs/QUICKSTART.md,
  docs/GETTING-STARTED.md, docs/outreach/blog-post-draft.md,
  docs/wiki/Developer-Guide.md, docs/wiki/User-Guide.md,
  .github/DISCUSSION_TEMPLATE/cartridge-proposal.yml, .gitignore,
  0-AI-MANIFEST.a2ml: dead adapter/v/ path references and stale
  three-layer-stack wording corrected to the Elixir+Zig reality.

Why no port was needed

The Elixir backend already exists as the canonical Class-3 REST/gRPC/
GraphQL surface; the V-lang adapter layer was retired estate-wide on
2026-04-10 and its .v files removed 2026-04-12. These were dangling
references only.

Intentionally left untouched

• CHANGELOG.md, ROADMAP.adoc, .machine_readable/6a2/*,
  .machine_readable/servers/order-ticket.a2ml — these document the
  V-lang retirement as history; not drift.
• Intentfile / Mustfile Unbreakable-Stack ban-enforcement assets —
  protected estate-rule surface, out of scope.
• Per-cartridge *_adapter.zig provenance comments and cartridge
  README.adoc adapter-language tables — accurate Zig-replacement
  provenance / a much larger doc surface outside this bounded
  dead-leaf cleanup.

Validation

=== YAML safe_load ===
OK  .github/workflows/lsp-dap-bsp.yml
OK  .github/workflows/e2e.yml
OK  .github/DISCUSSION_TEMPLATE/cartridge-proposal.yml

=== just --list ===
just --list OK (107 lines)   # build-adapter absent, all recipes intact

=== bash -n on edited shell scripts ===
OK  tests/e2e_full.sh
OK  tests/federation_multinode.sh
OK  tests/aspect_tests.sh
OK  scripts/boj-selinux-contexts.sh

=== a2ml sanity ===
0-AI-MANIFEST.a2ml — parens balanced

16 files changed, +98 / -248.

🤖 Generated with Claude Code