fix(agent-pod): install rust+gcc toolchain, symlink go, drop brave-search skill

poiman is Rust, portfolio is Go -- neither toolchain was reachable from an
interactive kubectl exec session (go's PATH export was local to its own
install script; rust was entirely absent, and cargo needs gcc as a linker
which also wasn't present).

brave-search was just a curl one-liner wrapped in its own skill file --
inlined the same curl command directly into info-collector/investigator's
instructions instead of dispatching to a separate skill for it.

k8s/apps/agent-pod/deployment.yaml

@@ -56,7 +56,7 @@ spec:
             - -c
             - |
               set -e
-              apt-get update && apt-get install -y git curl jq openssh-client tmux python3 sqlite3
+              apt-get update && apt-get install -y git curl jq openssh-client tmux python3 sqlite3 gcc build-essential
               ssh-keygen -y -f /root/.ssh/id_forgejo > /root/.ssh/id_forgejo.pub
               eval "$(ssh-agent -s)"
               ssh-add /root/.ssh/id_forgejo
@@ -69,6 +69,19 @@ spec:
                 https://github.com/Riotpiaole/agent-manager.git /root/agent-manager-src
               (cd /root/agent-manager-src && go build -o /usr/local/bin/agent-manager .)
 
+              # Language toolchains for whatever repos the implementer/investigator/
+              # judge roles actually build and test -- go was already fetched above
+              # only for building agent-manager itself, and its PATH export above is
+              # local to this script, invisible to `kubectl exec` sessions into the
+              # already-running container. Symlinking both into /usr/local/bin (on
+              # PATH for every exec session, interactive or not) instead of relying
+              # on shell rc sourcing, which pi's non-interactive tool calls don't do.
+              ln -sf /usr/local/go/bin/go /usr/local/bin/go
+              curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable
+              ln -sf /root/.cargo/bin/cargo /usr/local/bin/cargo
+              ln -sf /root/.cargo/bin/rustc /usr/local/bin/rustc
+              ln -sf /root/.cargo/bin/rustup /usr/local/bin/rustup
+
               node /root/hub.js
           env:
             - name: PI_BIN
@@ -140,8 +153,6 @@ spec:
                 path: judge/SKILL.md
               - key: resolver-SKILL.md
                 path: resolver/SKILL.md
-              - key: brave-search-SKILL.md
-                path: brave-search/SKILL.md
         - name: hub-src
           configMap:
             name: hub-src