feat(templates): add the ProfessionalSidebar layered CV preset

[DemchaAV]

Why

The CV family has sixteen presets and every one of them composes onto the page the caller sets. The design this PR promotes does not work that way: it is a specific sheet — 491.6 x 737.28pt, a navy plate capping a pale sidebar, geometry measured to two decimals — and it existed only as a published standalone template pinned to graph-compose:2.2.0, rendering from a JSON file and a folder of PNGs on disk.

It is also the first of the nine CV bundles in the promotion queue, so what it settles it settles for the rest: whether the family's CvDocument can carry a sheet drawn around slots it never had.

What changed

• cv/presets/ProfessionalSidebar — a DocumentTemplate<CvDocument> via create(), split for the 500-LOC rule into package-private ProfessionalSidebarStyles (the measured geometry, palette and Barlow Condensed / Lato scale), ProfessionalSidebarWidgets (headings, hairlines, the title-and-dates band), ProfessionalSidebarAside (monogram plate, contact channels, skill meters, education rail, language dots), ProfessionalSidebarMain (identity, profile, roles, projects, references) and ProfessionalSidebarIcons (the five packaged marks).
• The model needed no change — that is the result this PR reports, and it makes the remaining eight CV promotions preset-only. CvSkill already carries an optional level, so the skill bars and the language dots read the same field; CvEntry covers experience, education and projects; the five contact rows come off CvIdentity, with the tel: and mailto: targets built from the values rather than carried twice in the document.
• The preset owns its page and takes no BrandTheme — the first in the package to do either. Its palette and geometry are constants of its own, because a swappable one would stop it being the sheet it reproduces. package-info now describes both shapes the package holds.
• Sections reach their berth by title, not by Slot: the columns are fixed, so a document that never set a slot still renders, and one that sets them differently is overruled. Skills and languages are both SkillsSections — the same shape drawn in two hands, which is why a title naming both berths fills only the first.
• Letter-spacing is a run of its own: a text style carries no tracking, so each letter is written separately with a sized space between, and the spacer's type size is chosen to advance by the design's em value.
• The five PNG marks ship inside the templates artifact under templates/cv/professional-sidebar/icons/, each at the point size the design draws it at.

Verification

Full reactor gate (the eight CI modules) → BUILD SUCCESS; the preset's qa suite 12/12; examples suite 75/75 including CommittedAssetDriftTest with the new preview; javadoc:javadoc → 0 warnings.

Port parity, verified against the published template itself: the preset fed the template's own fixture is pixel-identical to the standalone render — 0 / 1,572,864 differing pixels, and the committed layout snapshot is node-identical to the bundle's — 158 of 158 nodes, same names, no geometry delta. The bundle's geometry is the same on its pinned 2.2.0 and on this branch (158/158 nodes, zero deltas > 0.01pt); the two engines differ only by the released ligature fix (#601), so the current-engine render is the parity target and the approved preview differs from it by that fix alone.

Notes

• The sheet holds one page, and says so. Its two columns are a single row, and a row is atomic, so a CV longer than the sheet raises AtomicNodeTooLargeException — it does not flow onto a second page. The preset draws no cap of its own, which is the deliberate half: MonogramSidebar, SidebarPortrait and MintEditorial cap each block and drop the rest silently, and a CV that quietly loses a job is worse than one that refuses to compose. The class documentation, using-templates.md and a test all carry it, and the natural follow-up is the ColumnPagination treatment this package already applies to TimelineMinimal.
• Three fields have nowhere to go on this sheet — a project's subtitle, an education entry's body, a SkillGroup's category — and a berth is filled by the first section that names it. All four are stated on the class and pinned by a test, because silently-dropped content is what a caller finds out the hard way.
• The sidebar's rows are one line each; a degree, skill or language longer than the narrow column overflows its band rather than wrapping. That is inherited from the design rather than introduced here.

Lane: canonical (templates.cv.presets + qa + examples) — no engine changes, no model changes.