Replace Printf.sprintf/printf and Format.asprintf/fprintf with
Fmt.str/pr/pf across publicsuffix, punycode, rate-limit, requests,
and openamp packages. Add fmt dependency to gen_corpus executables.

Auto-formatting and structural improvements from dune fmt across
precommit, publicsuffix, punycode, and requests packages.

Remove test_ prefix from test function names across test files where
the module name already provides the Test namespace.

Strip get_/make_/find_/create_ from 138 function definitions and all
call sites across ocaml-pds, ocaml-pid1, ocaml-precommit,
ocaml-publicsuffix, ocaml-qemu, ocaml-requests, ocaml-retry, and
ocaml-rpmsg. Use Module.v for constructors per the E331 convention.

- requests: convert test_signature, test_websocket, test_rfc9421_vectors
to modules exporting suite; add test.ml runner; delete standalone .mli
for test_simple/test_simple_head
- punycode: consolidate 2 test stanzas into single test.ml runner;
add .mli files; fix ace_prefix doc (E410)
- publicsuffix: rename psl_test.ml → test_psl.ml (E618)
- rpmsg: add missing test_rpmsg.mli and test_wire.mli (E600)

- ocaml-pds: test_blob_store (13 tests), test_sqlite_blockstore (14 tests)
- ocaml-publicsuffix: test_publicsuffix (21 tests, Mozilla PSL vectors),
test_publicsuffix_cmd (11 tests)
- ocaml-punycode: test_punycode_idna (51 tests, RFC 5891 IDNA vectors)
- ocaml-rpmsg: test_rpmsg (9 tests, Linux kernel rpmsg constants)

- E320: shorten long identifier names in irmin/test/test_pds_interop.ml
- E335: remove underscore prefix from used bindings (env)
- E405: add doc comment to test_pds_interop.mli
- E600: flatten suite to single pair (string * test_case list)
- E610: extract PDS interop helpers into irmin/lib/pds_interop.ml
- E718: consolidate fuzz modules (punycode, rate-limit, requests, rpmsg)

- Change `run` signature to `string -> (string * test_case list) list -> unit`
matching Alcotest's grouping convention
- Fix `_name` bug: pass the name through to Alcotest.run_with_args
- Each fuzz module now exports `let suite = ("name", [test_case ...])`
- Entry points (fuzz.ml) collect suites: `Crowbar.run "pkg" [Fuzz_X.suite]`
- Remove stale `add_test`/`suite` API, keep only `test_case`/`run`
- Remove `let run () = ()` from fuzz_common.ml files
- Update merlint E725 rule to match new `let suite = ("name", ...)` pattern
- Update E725 test fixtures and expected output

- Restore cursor on exit via at_exit in Tty.Progress (fixes TTY corruption)
- Install SIGINT handler in monopam test for clean Ctrl-C
- Add 2s per-iteration timeout and 2s total budget to crowbar
- Group crowbar alcotest output by module prefix ("mdns: foo" → group "mdns")
- Skip fuzz runtest in afl context (enabled_if <> profile afl)
- Add merlint E725: enforce "module: description" fuzz test name convention

Migrate Printf.sprintf to Fmt.str, Format.fprintf to Fmt.pf, and
Format.pp_print_string to Fmt.string across bundle, gpt, hap, homebrew,
jsonwt, matter, mbr, meross, paseto, precommit, publicsuffix, qemu,
retry, sdnv, slack, sle, space-packet, spake2, sqlite, squashfs, tar,
tc, tcf, tcpcl, tm, tomlt, tty, uslp, vlog, wal, wire, yamlrw, yamlt,
osrelease, space, xdge, and crypto test runner.

- License -> Licence
- color -> colour (in prose, not API/code)
- behavior -> behaviour
- analyze -> analyse
- organized -> organised
- Remove marketing buzzwords (leveraging)
- Remove emojis from prose

Comprehensive seed corpus for efficient AFL fuzzing:

Text/Protocol formats:
- cookeio: HTTP cookies (simple, full attributes, multi-value)
- jsonwt: JWT tokens (header, valid token)
- json-logs: JSON strings with escapes
- tomlt: TOML config files
- hostname: Domain names with ports
- xff: X-Forwarded-For headers, CIDR notation
- punycode: ASCII and Unicode domains
- mdns: DNS headers and queries

Binary formats:
- sdnv: RFC 6256 variable-length integers
- hap: HomeKit TLV encoding
- space-packet: CCSDS packet headers
- tc-1/tm-1: Telecommand/Telemetry frames
- sle: Space Link Extension TML headers
- tls: TLS records and handshake messages
- requests: HTTP/1.1 and HTTP/2 frames

Crypto:
- crypto: 32-byte keys
- csrf: CSRF tokens and secrets
- paseto: v3.local prefix and keys
- pbkdf2: passwords and salts
- spake2/srp: authentication parameters
- streaming-aead: keys, nonces, plaintext

Misc:
- sgp4: TLE satellite orbit data
- tty: ASCII, Unicode, ANSI escape sequences
- github-oauth: OAuth parameters
- rate-limit: IPv4/IPv6 addresses

Update comment headers to use standardized format:
- Quick check: dune build @fuzz
- With AFL: crow start --cpus=4

Remove verbose afl-fuzz commands and fuzz-afl aliases since
crow now handles building and running AFL instrumented fuzzers.

Update homepage/bug_reports in dune-project files to use the actual
upstream URLs (anil.recoil.org, github.com/mirage) instead of the
fork URLs. sources.toml overrides these when publishing to the fork.