fix(audits): make panic-attack suppressions fire (refs #187) (#300)

Fixes #187

## Problem

panic-attack's registry loader (`load_user_classifications`,
`src/assail/mod.rs`) reads the classification registry from
`<project_root>/audits/assail-classifications.a2ml` (or
`.panic-attack-classifications.a2ml`) only. Echidna kept its registry at
`reports/audits/`, so all 22 classification entries (16 pre-existing + 6
added in #186) were inert — the only suppressions firing were kanren
structural ones.

## Why a move (issue option 2) rather than a workflow input

The pinned reusable workflow
(`hyperpolymath/panic-attack/.github/workflows/scan-and-report.yml@1c38f33`)
exposes a single input, `repo_path` — the **scan root**, default `.` —
and no separate classifications-path input. There is nothing to point at
`reports/audits/` without also moving the scan root. So the
least-duplication fix is `git mv reports/audits audits`.

This also makes the registry self-consistent:
`assail-classifications.a2ml` and `audit-pa021-axioms-2026-05-26.md`
already cross-reference `audits/audit-ffi-boundary.md` /
`audits/assail-classifications.a2ml` — paths that were dangling at the
old location.

Pure 100%-similarity rename of 3 files; no content changes. The only
other in-repo mention of `reports/audits` is the historical
issue-tracker entry in `.machine_readable/6a2/STATE.a2ml` (a record of
#187's title, left as-is).

## Verification

Built panic-attack from source and ran `assail` against both layouts:

| Layout | weak_points | suppressed |
|---|---|---|
| pre-fix (`reports/audits/`) | 33 | 9 (kanren structural only) |
| post-fix (`audits/`) | 33 | **22** |

The 13 newly suppressed findings are exactly the classified FFI-boundary
surfaces: `src/interfaces/{graphql,grpc,rest}/ffi_wrapper.rs` (×2 each),
`ffi/zig/src/{boj,overlay,typell}.zig`, `src/rust/ffi/spark_axiom.rs`,
`src/zig/ffi/axiom_spark_bridge.zig`, `src/zig_ffi/chapel_bridge.zig`,
`src/rust/coprocessor/flint.rs`.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: hyperpolymath