Declare sisudoc.abstraction as a dub sub-package (spine:abstraction)
within the existing dub.json. The sub-package's sourcePaths cover
exactly the abstraction-side clusters that were freed from io_out
edges in phase 0 and phase 1:

  - src/sisudoc/abstraction (package surface + ssp serialiser)
  - src/sisudoc/meta        (per-document abstraction)
  - src/sisudoc/io_in       (file/pod ingress)

Its declared dependencies are spine:dyaml and spine:imageformats
only - no d2sqlite3, no io_out. The main "spine" package adds
spine:abstraction to its dependencies and lists those three
directories in excludedSourceFiles so dub does not compile the
abstraction-side sources twice when the executable is built with
--combined (as the nix derivation does).

(assisted by Claude-Code)

(also cgi_sqlite_search_form.d did not belong here)

(usually integrated as part of a pushed commit)

css: align body-flow <ul>/<li> & <details>/<summary> with <p>

Not used by sisudoc-spine but for hand-authored body-flow markup such as
the current homepage / body-flow, added block to each of the four html
CSS string heredocs in src/sisudoc/io_out/xmls_css.d

Existing tags are left in place and untouched.

(assisted by Claude-Code)

phase1 step2: move SSP serialiser into sisudoc.abstraction package

git mv src/sisudoc/io_out/create_abstraction_txt.d to
  src/sisudoc/abstraction/ssp.d

Module rename: sisudoc.io_out.create_abstraction_txt
  -> sisudoc.abstraction.ssp

Completes phase1: after this commit the sisudoc.abstraction package has
zero outgoing edges into sisudoc.io_out. The library produces both the
in-memory document object model AND the .ssp text serialisation without
referencing any output-side module.

The serialiser previously imported sisudoc.io_out.paths_output for the
single purpose of constructing the .ssp output path. That import is
dropped; the path construction is inlined as three lines of std.path
(chainPath / asNormalizedPath / array) producing
  <output_path>/<language>/abstraction/<doc_uid_out>.ssp
- byte-for-byte the same path the previous spineOutPaths!() call
produced.

Updated:
- src/sisudoc/abstraction/ssp.d - module decl + inline path
- src/sisudoc/abstraction/package.d - public import .ssp
- src/sisudoc/spine.d - import sisudoc.abstraction.ssp (x2)

Completes decouple abstraction phase1

(assisted by Claude-Code)

phase1 step1: introduce sisudoc.abstraction package re-export surface

Create src/sisudoc/abstraction/package.d as a library-facing re-export
module for the document-abstraction stage.

The surface currently re-exports:
- sisudoc.meta.metadoc          (spineAbstraction, A-layer entry)
- sisudoc.meta.metadoc_from_src (docAbstraction, B-layer entry)

No code moves; no behaviour change. The package exists so external
consumers can `import sisudoc.abstraction;` and reach the entry points
without depending on spine's internal directory layout.

(assisted by Claude-Code)

phase0 step2: move curation modules from meta/ to io_out/curate/

Curation modules moved to src/sisudoc/io_out/curate/, module
declarations renamed sisudoc.io_out.curate.metadoc_curate* from
sisudoc.meta.metadoc_curate* and updated spine.d imports. File contents
are otherwise unchanged.

Completes phase0: meta/ now has zero io_out imports - the abstraction
core's outgoing deps are now only:
  meta/ internals + io_in/ + ext_depends/D-YAML

(assisted by Claude-Code)

phase0: drop vestigial io_out.hub coupling from meta/metadoc.d

phase0 step1: abstraction-library extraction/decoupling: meta/ should
not import io_out/.

Removed unused call to `import sisudoc.io_out.hub;` `mixin outputHub;`
from `template spineAbstraction()`. (the load-bearing UFCS site is
spine.d:92 which has its own `mixin outputHub).

(assisted by Claude-Code)