feat(aiignore): add .aiignore and the recursive-read convention

Agents (and any future inventory tool) doing a naive recursive read of a project pick up node_modules, __pycache__, build output, and token artifacts even when those are gitignored, because a recursive read sees the disk, not git. I added a gitignore-syntax .aiignore at the repo root with the default skip list, and a protocols.org "Recursive Reads" subsection documenting the convention, the defaults to assume absent a file, and the lockfile policy (skip on agent reads, independent of git-tracking).

I did not wire the walking scripts (audit.sh, diff-lang.sh, sync-language-bundle.sh): they do targeted finds over .ai/.claude/bundle dirs, never whole-tree walks, so honoring .aiignore there would be dead code. That belongs in a future catalog tool.

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