fix(protocols): drop a dead link and the stale file behind it

protocols.org pointed at references/calendar-reference.org, which the template rsync never copies. The link was dead in every consuming project. It now points at the four calendar workflows, which do sync. They already carry the tool names, both account ids, and the gcalcli fallback.

The reference file itself is gone. Nothing linked it any more. It existed as two copies that sync-check doesn't gate, and all three credential paths in it had been dead since the OAuth keys moved into the encrypted MCP bundle. protocols.org now names mcp/README.org as the authority instead, in prose rather than a link, so it can't go dead downstream the same way.

I dropped one fact with it on purpose: that the Google Cloud app runs in production mode so tokens don't expire weekly. It's checkable in the console and it was the last live line in the file.

The same defect class turned up at seven more sites in four synced workflows, all reaching outside .ai/ with ../../. I filed those rather than fixing them here. scripts/lint.sh already has a check built for exactly this and misses them because it only matches markdown link syntax.

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