initial drop: Dialectic.PlexumPlugin v0.1

Port of Dialectic.OpenclawPlugin to the Plexum SDK. 8 dialectic_*
tools wired to Dialectic.Backend over HTTP:

  list_topics, topic_detail, list_arguments, propose_topic,
  signup, post_argument, submit_verdict, view_verdict

Differences from the OpenClaw port worth noting:

  - Per-agent API key storage: OpenClaw used secret-mgr (one entry
    per agent's keyspace). Plexum has no secret-mgr; v1 stores
    keys directly in plugin config (apiKey + agentKeys map).

  - Agent identity at tool dispatch: OpenClaw framework surfaces
    ctx.agentId; Plexum SDK doesn't yet plumb the calling agent
    through ToolPlugin.CallTool. v1 falls back to
    config.defaultAgentID — same stop-gap HarborForge.PlexumPlugin
    is on. Tracked as upstream SDK work.

  - HF on_call coverage pre-check on signup: stub that always
    returns "skipped", matching OpenClaw v1's behavior (HarborForge
    never shipped the cross-plugin coverage query). pre_validated
    is sent as false so the backend records audit honestly.
    DIALECTIC_PLUGIN_BYPASS_HF=1 env retains parity with OpenClaw.

  - Activation: lazy (no background services, unlike HarborForge's
    eager-spawn for the calendar scheduler + monitor bridge).

Backend client follows the bearer-auth contract OpenClaw's
backend-client.ts established; endpoint shapes are unchanged.

scripts/install.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# Dialectic.PlexumPlugin installer.
+set -euo pipefail
+
+REPO="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
+PROFILE_DIR="${HOME}/.plexum"
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --profile) PROFILE_DIR="$2"; shift 2 ;;
+    -h|--help) sed -n '2,/^set -euo/p' "$0" | sed 's/^# \{0,1\}//'; exit 0 ;;
+    *) echo "unknown flag: $1" >&2; exit 2 ;;
+  esac
+done
+
+log() { printf '\033[1;34m[dialectic-install]\033[0m %s\n' "$*"; }
+command -v go >/dev/null || { echo "go not found on PATH" >&2; exit 1; }
+
+PLUGIN_DIR="${PROFILE_DIR}/plugins/dialectic"
+mkdir -p "${PLUGIN_DIR}"
+
+cd "${REPO}"
+VERSION="$(git describe --tags --always 2>/dev/null || echo dev)"
+LDFLAGS="-X main.Version=${VERSION}"
+log "building plexum-dialectic-plugin (v=${VERSION})"
+CGO_ENABLED=0 go build -ldflags="${LDFLAGS}" \
+  -o "${PLUGIN_DIR}/plexum-dialectic-plugin" \
+  ./cmd/plexum-dialectic-plugin
+
+cp manifest.json "${PLUGIN_DIR}/manifest.json"
+log "installed binary + manifest to ${PLUGIN_DIR}"
+
+cat <<EOF
+
+Next steps:
+  1. Add to ${PROFILE_DIR}/plexum.json .plugins.allow:
+       "dialectic"
+  2. Write ${PLUGIN_DIR}/config.json — sample:
+     {
+       "backendUrl": "https://dialectic-api.hangman-lab.top",
+       "apiKey": "g1_xxx",
+       "defaultAgentID": "agent-xyz"
+     }
+     (multi-agent claws: use "agentKeys": { "<agent-id>": "g1_yyy", ... })
+  3. Restart the host:  systemctl --user restart plexum
+EOF