fix(container): keep V vlib co-located with binary; update Zig req to 0.15

V resolves VROOT relative to the real executable path, so vlib must
live alongside the v binary. Cloning to /opt/vlang and symlinking the
binary (instead of copying and deleting the source) keeps vlib accessible.

Also: QUICKSTART-USER.adoc — Zig >= 0.15, remove V prereq, 96 cartridges.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyperpolymath

QUICKSTART-USER.adoc

@@ -10,7 +10,7 @@ toc::[]
 
 == What is BoJ Server?
 
-Bundle of Joy (BoJ) Server is a cartridge-based MCP protocol gateway. Each cartridge (database-mcp, fleet-mcp, nesy-mcp, etc.) is a formally verified Idris2 ABI + Zig FFI + V-lang adapter triple. The server exposes REST (port 7700), gRPC (7701), and GraphQL (7702) endpoints. 70+ cartridges cover databases, clouds, messaging, CI/CD, and more.
+Bundle of Joy (BoJ) Server is a cartridge-based MCP protocol gateway. Each cartridge (database-mcp, fleet-mcp, nesy-mcp, etc.) is a formally verified Idris2 ABI + Zig FFI + unified adapter triple. The server exposes REST (port 7700), gRPC (7701), GraphQL (7702), and SSE (7703) endpoints. 96 cartridges cover databases, clouds, messaging, CI/CD, git forges, secrets, queues, proofs, and more.
 
 Three-class architecture: Class 1 (simple CLI), Class 2 (orchestrator with webhooks/MQTT), Class 3 (BEAM multiplier for global scale).
 
@@ -25,13 +25,9 @@ Three-class architecture: Class 1 (simple CLI), Class 2 (orchestrator with webho
 | `asdf install idris2 latest`
 
 | Zig
-| >= 0.13
+| >= 0.15
 | `asdf install zig latest`
 
-| V (vlang)
-| >= 0.4.4
-| `asdf install vlang latest`
-
 | just
 | >= 1.25
 | `cargo install just`

container/Containerfile

@@ -47,12 +47,11 @@ RUN for ffi_dir in /build/cartridges/*/ffi; do \
     done
 
 # Build V compiler from source (no Wolfi package available).
-# V bootstraps via a small vendored C file — gcc compiles it in seconds,
-# then V uses itself to finish the full build (~2 min).
-RUN git clone --depth 1 https://github.com/vlang/v /tmp/vlang && \
-    cd /tmp/vlang && make && \
-    cp v /usr/local/bin/v && \
-    rm -rf /tmp/vlang
+# V is installed to /opt/vlang so vlib stays co-located with the binary
+# (V resolves VROOT relative to the real executable path).
+RUN git clone --depth 1 https://github.com/vlang/v /opt/vlang && \
+    cd /opt/vlang && make && \
+    ln -sf /opt/vlang/v /usr/local/bin/v
 
 # Compile V adapter binary, linking against all Zig FFI shared libs.
 RUN LFLAGS="-L/build/ffi/zig/zig-out/lib" && \