Layers & model boundaries (v0.4.6): asset layers, Atlas layer columns, move_asset

[SylonZero]

Implements docs/specs/layers-and-boundaries-spec.md (#51) — the products ship, assets change rule made operational.

assets.layer (migration 0016, both dialects)

Free text with a conventional taxonomy (edge · frontend · backend · domain · data · infra · shared). Unset layers get a display-time default from asset type (app→frontend, service→backend, datastore→data, platform→infra, library→shared) — computed on read, never written to rows, so existing instances get a sensible layered map with zero migration. Surfaced in the asset edit panel (taxonomy datalist), as a chip on the asset detail header, on Grid cards, and as a sortable Table column.

Atlas layer columns

A "Columns: Product | Layer" toggle joins the map toolbar, and the map auto-defaults to Layer columns when a single product is in scope — the exact case (e.g. a production single-SaaS instance with ~40 assets) where the product axis degenerates to one column. Layer columns order by the taxonomy so dependency edges mostly flow one direction; in layer mode with multi-product scope, node sublabels show the product. Lenses, hover blast-radius, and filters unchanged. Verified in the browser against the demo dataset.

move_asset — model refactoring with semantics

• Blocked while draft/active plans target the asset — the error returns blockingPlans so an agent can retarget or complete them and retry.
• Work items follow the asset to the new product; history is history — release stamps, completed-plan links, capabilities, and design-log entries are preserved untouched.
• No-op when already in the target product; access validated for both products at the caller layer. (The "Move to product…" UI action follows in a later pass — MCP is the primary interface, and model refactoring is agent work.)

MCP (41 → 42 tools)

• layer param on create_asset / update_asset; new move_asset tool.
• get_modeling_guide gains a boundaries section (the rule, worked examples, a refining recipe) and the layers taxonomy with defaults.
• One-line boundary heuristics added to create_product / create_asset descriptions — for agent-driven modeling, the tool description is the UX.

Seed, tests, docs

• Demo seed assigns 4 explicit layers (API Gateway & Mobile BFF → edge, Plan Engine → domain, UI Component Library → frontend); the rest demonstrate type defaults.
• 5 new tests — effective-layer derivation, inventory layers, move blocking/carrying/preserving — 206 total, all passing; typecheck and production build clean.
• Docs synced: app-spec (schema, route, mutations, MCP), AI-agents guide (catalog + modeling-boundaries note), Atlas guide (columns toggle), MCP spec, site (badge v0.4.6, status row, spec card); spec marked shipped; package.json → 0.4.6.

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