docs: complete the code audit (S5-S7) and triage findings into tasks

Ran read-only audits over the last three coverage slices: the VM test framework (S5), the Python (S6), and the elisp prototype (S7). That closes the sentry code-inspection sweep -- all seven slices covered.

S5 turned up five bugs (one Major: run-net-scenarios prints a diagnose failure but exits green) and three refactors. S6 found one bug plus a High test-quality defect -- the pacman-hook-order test compares two string literals, so the boot-critical hook ordering it claims to guard is never actually measured. S7 found three Minor bugs in the gallery-widget prototype (the needle clamps while the readout doesn't, a missing cl-lib require, a nil-path load) plus refactor and coverage gaps.

Appended every finding to the sentry findings doc, marked the coverage tracker, and filed six graded tasks: the two Major/High defects as [#C], and four [#D] clusters (VM-framework robustness, prototype elisp bugs, test-quality, and a test-framework/prototype refactor group). Detection only -- nothing fixed here.

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