chore: file eight bug findings and stage four shared-asset proposals

Overnight hygiene sweep of this repo. Everything here is a finding or a staged proposal. No rule, workflow, script, or bundle file was modified.

The one that matters: the python and typescript language bundles ship no pre-commit hook, so a project installing either gets no credential scan on commit. Both bundles predate the hook rollout that swept go and bash, and install-lang skips missing components without a word, so it went unnoticed for two months. Live on two projects, one of them work. Filed [#A].

Seven more findings landed. The largest is a non-atomic write in the cross-project inbox tool, which can strand an empty handoff in another project's inbox and block a turn there. The rest are lint noise and two gaps in the Signal channel. An eighth was filed and then retracted the same night, once a retest showed I had compared two different files and read the difference as a bug.

Four proposals from other projects are staged under working/ with verified diffs, each behind a VERIFY task, waiting on a decision.

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