docs(skills): add signed-range query recipe

[tobyhede]

Summary

• document the signed-range decomposition for absolute-value buckets over EQL v3 ordered columns
• show all four encrypted bounds and the reversed negative inequalities
• clarify the adjacent TextSearch/TextMatch operand comment
• add a stash patch changeset

Closes the documentation gap identified in #601 and #664.

Validation

• git diff --check
• targeted skill/changeset guards: 30 tests passed in the source workspace

[changeset-bot]

🦋 Changeset detected

Latest commit: 24f7b2c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
stash	Patch
@cipherstash/basic-example	Patch
@cipherstash/e2e	Patch
@cipherstash/stack-drizzle	Patch
@cipherstash/stack-prisma	Patch
@cipherstash/stack-supabase	Patch
@cipherstash/stack	Patch
@cipherstash/wizard	Patch
@cipherstash/bench	Patch
@cipherstash/prisma-example	Patch
@cipherstash/test-kit	Patch

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[freshtonic]

Approved. The signed-range decomposition is correct for EQL v3 DoubleOrd: it encrypts all four bounds, reverses the negative inequalities, validates 0 <= min < max, and uses the correct eql_v3.query_double_ord operand domain. The changeset is present, git diff --check passes, and all required CI checks are green.

Non-blocking follow-up: carry this raw-SQL recipe through the public documentation site / any remaining user-facing entry points so the guidance is discoverable outside the agent skill repository.