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perf: trim per-node signal count by merging deriveds (#31)

* test: add per-node signal-budget guardrails (#23)

Source-inspection tests asserting the merged/inlined derived budgets
for JsonPrimitiveValue and ExpandableObject. Currently red — the #23
implementation (merge kind/rendered/activeSnippet; inline childLevel/
hasField/lastIndex) follows in the next commit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* perf: trim per-node signal count by merging deriveds

Every $derived is a reaction object with a deps array, so a large tree
holds one per derived per node. Collapse the redundant ones:

- JsonPrimitiveValue: merge the kind/rendered/activeSnippet trio into a
  single `primitive` derived returning a discriminated union
  { kind, text, valueStyle, snippet }, dropping a leaf row from 5
  reactions to 3. The predicate narrowing also removes the per-branch
  value casts.
- ExpandableObject: inline the trivial scalar deriveds childLevel
  (level + 1), hasField (field !== undefined), and lastIndex
  (count - 1) at their use sites, dropping a container from 10 to 7.

Pure internal refactor: identical rendered output and snippet dispatch.
Turns the signal-budget guardrails green.

Closes #23

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* refactor: tidy PrimitiveRender type and inline hasField

Cleanup pass on the #23 signal-count refactor:

- Extract the shared { text, valueStyle } fields into a base type
  intersected with the discriminated kind/snippet arms, instead of
  restating them on all 9 union members. Preserves the kind-based
  narrowing the template relies on for type-safe snippet dispatch.
- Inline hasField as `field !== undefined` at its single use site, the
  same trimming already applied in ExpandableObject, dropping a leaf
  row to 2 derived reactions.

No behavior change; svelte-check and the full suite stay green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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