Run mdx on lib/cache.mli so the {[ ... ]} odoc block now type-checks.

The example referenced `env` out of nowhere when calling
`Eio.Stdenv.clock env`. Wrapped in `let run () = Eio_main.run @@ ...`
so the env is bound, and replaced the trailing `(* Some "answer" *)`
prose comment with `assert (MyCache.get cache 42 = Some "answer")`
so the documented round-trip is verified at mdx test time.

The READMEs all share the standard install/overlay snippet, but the
sh blocks lacked the "<!-- $MDX skip -->" directive. `dune test`
would shell out to `opam install` against the live switch, which
either prompts interactively or fails with a package conflict —
either way diffing as a test failure.

Bulk-add skip directives in front of every install/overlay block.
Also collapse the doubled "non-deterministic + skip" stack on three
READMEs (memtrace, ocaml-dpop, ocaml-pid1, ocaml-yaml, merlint) where
`skip` already implies the runtime is bypassed.

38 subtrees lacked a (source ...) stanza in their dune-project, so
their generated .opam files had no dev-repo: field. That broke
downstream tooling that uses dev-repo to identify the subtree
(notably the root.opam external-dep filter, which couldn't tell
internal packages from external ones).

Add (source (tangled gazagnaire.org/<subtree>)) to each, matching
the URL configured in sources.toml. dune regenerates dev-repo:,
homepage: and bug-reports: in every affected .opam.

Pure formatting changes from `dune fmt`: doc comment placement moves
from above the binding to below it for `type`s, multi-line `match`
expressions collapse onto one line where they fit, and infix operator
applications pick up spaces (`Soup.($?)` -> `Soup.( $? )`). No
semantic changes.

Warning 69 (unused-field, mutable-never-assigned). Four independent
record fields were flagged as mutable but the code only mutates their
referents in place, never rebinds the record slot itself:

- ocaml-wal/lib/wal.ml: [t.file] (the Eio file resource; methods call
Eio.File.pwrite_all etc., the slot is set once at open time).
- ocaml-block/lib/block.ml: [Memory.state.data] (the backing bytes,
written via Bytes.blit_string; [Bytes.t] is already mutable).
- ocaml-sse/lib/sse.ml: [Parser.t.data_buf] (a Buffer.t, written via
Buffer.add_*; the slot never changes).
- ocaml-zephyr/lib/zephyr.ml: drop [mode : Read | Write] entirely —
set at open-time, read nowhere. The open_read / open_write
constructors already distinguish the two call shapes, so mode
tracking was redundant.

Generate .opam.template files with x-quality-* fields based on
detected package features:
- x-quality-build: has lib/ with .ml files
- x-quality-test: has test/ with .ml files
- x-quality-fuzz: has fuzz/ with .ml files
- x-quality-interop: has test/interop/ directory
- x-quality-cram: has test/*.t/ directories

These fields are picked up by dune's opam generation and will be
checked by merlint E910 for consistency.

Also: add fmt dep to ocaml-sse/lib/dune (Fmt.pf used without dep).

monopam quality — scans packages for quality features, caches by
git commit hash. 166 packages: build=163, test=162, fuzz=94,
interop=39, doc=42.

Standard vocabulary based on crates.io categories, erratique/opam
conventions, and monorepo domain coverage:

Org: org:blacksun
Domain: aerospace, codec, crypto, network, storage, git, merkle
Purpose: cli, test, bench, format, log, system
Protocol: ccsds, uslp, cop1, sdls, sle, atproto, tls, http, json, binary
Cross-cutting: eio, simulation, math, compression

Tags placed in dune-project (package ...) stanzas via (tags ...).
Propagated to .opam files by dune's opam generation.

- Update .ocamlformat to 0.29.0 across all 591 files
- csvt: reuse single Buffer.t for field reads (no alloc per field)
- sexpt: Obj members decoded from stream into Dict, typed Variant GADT
- Reformat all source files for 0.29.0

Add missing periods to doc comments, fix [name] format mismatches,
rename camelCase variant constructors to snake_case in hooks.ml,
and apply dune fmt formatting.

Flatten multi-group test suites to single pairs (string * test_case list)
across bpsec, btree, bundle, bytesrw-eio, cfdp, cgr, claude-skills, and
claudeio. Update test.ml runners to wrap suites in lists. Add missing
test_cache.mli. Fix E600 linter to skip standalone executables and
utility libraries that happen to have a test_ prefix by checking whether
the corresponding .ml defines a suite value.

Fix E617 by renaming test suite names to match filenames (remove 'u'
prefix in btree/cbort, lowercase in cgr). Fix E605 by extracting
cache tests into test_cache.ml and adding test_outgoing.ml stub.
Improve e605 rule to generically handle any source directory instead
of hardcoding lib/src/proto — non-standard dirs are preserved under
test/ (e.g. proto/foo.ml -> test/proto/test_foo.ml).

Convert all packages from:
(source (uri https://tangled.org/handle/repo))
to:
(source (tangled handle/repo))

This uses dune 3.21's native tangled support for cleaner source
declarations. Also removes redundant homepage/bug_reports fields
that are auto-generated from tangled sources.

No centralized doc site available yet.