Record no-authored-change impact reviews for parser.go (PR #283)

Clears the authored_delta_expected audit warning that blocked PR #283.
Records explicit no-authored-change impact reviews for all 83 requirements
owning parser.go via the per-branch sidecar (proof/impact-reviews/).

Rationale: the OSS-Fuzz 4649128545288192 Delete panic fix (commit a6c5ed3)
guards the data[prevTok] dereference. The owning requirements already
specified no-panic on malformed input (e.g. SYS-REQ-035 'shall not panic'),
so the authored intent is unchanged -- the implementation now complies
with the existing specification.

Author: buger