fix(beads): preserve legacy registry formula names (FUZZ-013 r2)

[randlee]

Fixes comp-t-7.fuzz-013-r2-fix (round 2 of FUZZ-013, filed by comp-t-7.2-qa): validate, preview_pour and pour accept Phase R registry formula_name spellings again; graph-mode (attach/preview_attach) stays strict; empty name gives BEADS_FORMULA_NAME_REQUIRED.

Gates at 3603608: clippy -D warnings clean, fmt clean, cargo test --workspace 1063 passed / 0 failed / 0 ignored.

🤖 Generated with Claude Code

[randlee]

QA fix verification: comp-t-7.fuzz-013-r2-qa (fuzz-013) at 3603608

Verdict: PASS. 1 carried finding verified fixed.

Finding	Disposition
fuzz-013	fixed

Local fmt, clippy -D warnings and tests clean at this head. CI not checked (rate-limit rule). Dev-sanity passed at this head.

Round 2 of fuzz-013. Verified against the carried finding's acceptance criteria: legacy names ('re g0', accented, 'a+b', empty) no longer fail with BEADS_REQUEST_DESERIALIZATION_FAILED on render, validate, preview-pour and pour; pour and preview-pour with an empty name give BEADS_FORMULA_NAME_REQUIRED; preview-attach and attach stay strict; the FUZZ-013 test is un-ignored (17 passed in fuzz_regressions, 22 in contract) and fails at the round-1 commit 1266f41.

Observation, not a finding of this round: a wrong-typed formula_name (for example 5) is now silently dropped on render, validate, preview-pour and pour instead of failing deserialization (attach and preview-attach still reject it). Whether origin/develop rejected it could not be established (develop has no request.rs), and it is outside the carried finding's criteria, so it was not held against the fix. The verifier was asked about it by me; I reported it as an extra check. Recommend the lead decide whether to file a follow-up bead (strip only string-typed names, keep the original error for other types). The FUZZ-013 test covers only parse_request, not the CLI, the empty name or the wrong-type case.

Verification used a fake-bd stub (post-parse failures such as BEADS_WHERE_FAILED come from the stub).