QN processor fails at block 500985... no COMMENT_TIP_TIERS

Orion is fully synced

docker logs orion_archive_ingest
{"level":2,"time":1759550645589,"ns":"sqd:substrate-ingest","msg":"last block: 14769348, progress: 0 blocks/sec, write: 193 blocks/sec"}

fails processing blocks: Error: Cannot determine value of config variable COMMENT_TIP_TIERS

$ docker logs orion-processor
...
{"level":2,"time":1759550286054,"ns":"sqd:processor:mapping","msg":"Processing Members.MemberRemarked event in block 500985..."}
{"level":5,"time":1759550286061,"ns":"sqd:processor","err":{"stack":"Error: Cannot determine value of config variable COMMENT_TIP_TIERS\n    at Config.get (/squid/lib/utils/config.js:79:19)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async commentTipTierParams (/squid/lib/mappings/content/commentsAndReactions.js:239:22)\n    at async processCreateCommentMessage (/squid/lib/mappings/content/commentsAndReactions.js:302:27)\n    at async processMemberRemarkedEvent (/squid/lib/mappings/membership/index.js:55:11)\n    at async processEvent (/squid/lib/processor.js:233:5)\n    at async /squid/lib/processor.js:282:17\n    at async TypeormDatabase.runTransaction (/squid/node_modules/@subsquid/typeorm-store/lib/database.js:110:13)\n    at async TypeormDatabase.transact (/squid/node_modules/@subsquid/typeorm-store/lib/database.js:64:24)\n    at async Runner.process (/squid/node_modules/@subsquid/substrate-processor/lib/processor/runner.js:117:17)"}}

It's in .env but missing from docs/operator-guide/examples/.env.

Compare the root .env entry around line 42 with docs/operator-guide/examples/.env. Add the missing COMMENT_TIP_TIERS setting to the operator example, then verify the example includes the configuration required by comment processing and no longer reproduces the reported startup failure.