fix: resolve discourse-mcp TS2345 build error and add env-var auth

The discourse-mcp was BLOCKED with a TypeScript TS2345 error caused by
the Dockerfile forcing SDK ^1.23.0 via `pnpm add`, while the upstream
code requires the lockfile's v1.17.3. Removed the override to use
`pnpm install --frozen-lockfile`.

The upstream server does not read environment variables directly — it
requires CLI args (--auth-pairs, --site) or a --profile JSON file. Added
a docker-entrypoint.sh that converts DISCOURSE_URL, DISCOURSE_API_KEY,
and DISCOURSE_API_USERNAME env vars into a profile JSON with auth_pairs
and site tethering.

Validated end-to-end: MCP handshake passes, site auto-tethers on startup,
live tool calls (discourse_search, discourse_filter_topics) return real
data from community.turnsys.com.

Updates STATUS.md and README.md to reflect discourse-mcp as production
ready. Adds JOURNAL.md entries for discourse-cli, discourse-mcp fix, and
protocol improvements.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

dockerfiles/discourse-mcp/docker-entrypoint.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+# Convert env vars to discourse-mcp CLI arguments, then exec the server.
+#
+# Env vars:
+#   DISCOURSE_URL          - base URL of the Discourse site
+#   DISCOURSE_API_KEY      - API key
+#   DISCOURSE_API_USERNAME - username for the API key
+#
+# When DISCOURSE_URL is set, the server is tethered to that site with auth
+# pre-configured. Otherwise, the client must call discourse_select_site.
+
+set -e
+
+ARGS=""
+
+if [ -n "${DISCOURSE_URL}" ]; then
+    ARGS="${ARGS} --site ${DISCOURSE_URL}"
+
+    if [ -n "${DISCOURSE_API_KEY}" ]; then
+        AUTH_PAIR="{\"site\":\"${DISCOURSE_URL}\""
+        AUTH_PAIR="${AUTH_PAIR},\"api_key\":\"${DISCOURSE_API_KEY}\""
+        if [ -n "${DISCOURSE_API_USERNAME}" ]; then
+            AUTH_PAIR="${AUTH_PAIR},\"api_username\":\"${DISCOURSE_API_USERNAME}\""
+        fi
+        AUTH_PAIR="${AUTH_PAIR}}"
+        ARGS="${ARGS} --auth-pairs '[${AUTH_PAIR}]'"
+    fi
+fi
+
+ARGS="${ARGS} --allow-writes --read-only false"
+
+exec eval node dist/index.js ${ARGS} "$@"