fix(state,vscode-wcs): recursive-path quality pass after five review cycles - #261

- Index spellings in API path arguments ($setAll / $resolve, including
  wildcard-and-index mixes such as `nodes.*.children.0.total`) are folded
  to `*` before the recursion-readonly check, on both the runtime and the
  editor side, with the same predicate as ResolvedAddress.
- The editor no longer reports "declares no $recursion anchor" when the
  default export brings the declaration in through a top-level spread.
- `**` assignments inside string / template literals are not diagnosed.
- Test fixes and wording; impl-plan §7-5 / §7-6.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Runtime (@wcstack/state):
- Index spellings in the suffix of a `**` path (`nodes.**.children.0`,
  `.children.0.children`, `.children.0.total`) are folded before the
  structural / readonly checks, so they no longer replace the structure
  or stop mid-write with a raw TypeError.
- A `**` getter whose suffix names the recursion structure itself
  (`nodes.**.children`, `.children.length`, index spellings of those)
  is rejected when the declaration is read instead of shadowing the
  real child list.
- $trackDependency rejects `**` like the other APIs do.
- Re-seeding with the same state object also drops cache entries of
  `**` getters whose suffix contains a wildcard.
- The recursion declaration is validated before the state object is
  swapped in, so an invalid re-seed leaves the element on the previous
  generation.
- Concrete paths for bound reads are memoized per (suffix, depth);
  unused walk options / parts types removed; hasRecursion and
  recursionRegistry are required on IStateElement.

Editor / lint (vscode-wcs):
- No error when the repeat sub-path is not a plain string literal
  unless it is definitely not a string; `${}`-free template literals
  are accepted.
- Structural `**` getter keys, non-array $getAll indexes (`null`, a
  literal) and index-spelled suffixes are diagnosed with the runtime's
  codes.

Known defect #257 now also covers the new declaration-time raise
(pinned in integration.recursionKnownDefects.test.ts). Docs: README
(en/ja), CHANGELOGs, impl-plan §7-7.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Runtime (@wcstack/state):
- A concrete getter with the same name as a `**` getter's expansion
  (`get "nodes.*.children.*.total"()`) is rejected when the declaration
  is read, not on the first read of that depth.
- A mounted component (bind-component) that declares a `**` getter gets
  the wcs/mount-dollar-declaration notice instead of being dropped
  silently.
- The read-only check's memo is keyed by the folded pattern, so index
  spellings no longer grow it; the recursion-anchor message lives in
  pathDiagnostics; the 127/128/129 depth boundary is pinned.

Editor / lint (vscode-wcs):
- Concrete-getter collisions, `++` / `--` on `**` or expansion paths,
  and `$recursion` / `**` getters inside a bind-component block are
  diagnosed; computed keys and spreads inside the `$recursion` value
  are treated as "cannot decide" instead of "empty".
- Mount / volume blocks still get the declaration-independent checks.
- smoke-test: a state that brings `$recursion` in through a spread
  must exit 0 (passes once dist/cli.cjs is rebuilt).

Docs: README (en/ja) "not in this version" list and union order,
demo README, CHANGELOGs consolidated (unreleased fixes folded into
Added; the plain $getAll indexes diagnostic kept under Changed),
impl-plan §7-8.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Runtime (@wcstack/state):
- A recursive $setAll into the value of an expansion shifted by the
  repeat (`nodes.**.children.*.total.x`) is refused before the walk,
  like the other read-only forms (coversSuffix).
- The write-side read-only gate memoizes per interned PathInfo, so a
  state with $recursion pays no measurable overhead on unrelated
  writes (was up to 1.5x).
- Declaration-time raises carry wcs/recursion-declaration-invalid;
  a `**` getter key that does not match the anchor reports
  wcs/recursion-anchor through the shared message.
- A `**` suffix with an empty segment or a bare `*` right after `**`
  is refused on both sides.
- Re-seeding without $recursion also deletes the previous
  generation's own generated accessors; every pure validation of a
  re-seed runs before any teardown, so a failed re-seed leaves the
  element entirely on the previous generation.
- registry.ts split: pure path algebra in expand.ts, generation
  teardown in generation.ts, materialize.ts folded into getByAddress;
  the walk reuses the registry's concrete-path memo.
- Test harness shared through __tests__/helpers/recursionTestUtils.ts.

Editor / lint (vscode-wcs): coversSuffix / foldSuffixIndexes parity
for the forms above.

Docs: README (en/ja) diagnostics table, design doc §10 / §6-3,
set-all design §6-2, demo README, CHANGELOGs, impl-plan §7-9.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Runtime (@wcstack/state):
- The read-side materialization gate memoizes per interned PathInfo,
  symmetric with the write side; the duplicate string-keyed negative
  memo is gone.
- defineState types `this["nodes.**.value"]` and `this["nodes.**"]`
  as any (same index signatures as the editor preamble).
- An index segment inside the anchor or repeat sub-path
  (`{ "nodes.*": "children.0.*" }`) is wcs/recursion-declaration-invalid.
- IRecursionSpec carries anchorList / repeatList; findDescriptor is
  shared with State; unused exports and debug output removed.

Editor / lint (vscode-wcs):
- `$recursion: [...]` is reported; `${}`-free template literals are
  read as path arguments (this also reaches wcs/index-arity and
  getter-untracked-read).

Docs: README (en/ja) features and "not in this version", define-state
and typescript docs (en/ja), design doc D12 / §7-2, demo note,
CHANGELOGs rewritten as the final contract, impl-plan §7-10.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Rebuilt from packages/vscode-wcs so the committed wcs-validate matches
the editor diagnostics changed in review cycles 1-5. The smoke test
(18 cases, including the new spread-declaration case) passes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>