feat: add Special Situations SDK workflows

[daniel-scrivner]

Scope

Adds the customer-facing Special Situations namespace to the public JavaScript SDK: current situations, paid immutable issue archive, Copy-for-LLM exports, and related research endpoints.

Validation

• bun run typecheck
• bun test (94 passing)
• bun run build

Adversarial review record

Pass 1 accepted and fixed: removed an unsupported since parameter and avoided exporting copied internal generated-contract comments.

Pass 2 accepted and fixed: added URL assertions for every new namespace method. The archive endpoints are explicitly dependent on datastream PR #1363 before this release can be published.

Deliberately remaining

• Do not publish this SDK release until datastream #1363 is merged, deployed, and production-smoked.
• Python, Go, Rust, and Skills mirrors are separate follow-on PRs.

[daniel-scrivner]

Underwriting-pack adversarial review record

• Pass 1 (GPT-5.5 High): no material findings.
• Accepted feedback: none.
• Rejected feedback: none.
• Verification: focused SDK route tests, full SDK tests, typecheck, and diff hygiene passed.
• Dependency: situations.underwrite requires the API deployment containing datastream PR #1363.

[daniel-scrivner]

Situation watch SDK adversarial review record

• Pass 1 (GPT-5.5 High): accepted and fixed. Aligned the exported generated monitor schema with the structured searchMode values accepted by the helper.
• Pass 2 (GPT-5.5 High): accepted release-order dependency. Exact situationIds watches require autonomous-computer/omni-datastream#1373, which adds the strict server contract, query behavior, and delivery provenance. Do not merge/release this SDK update before #1373 is merged and deployed.
• Rejected feedback: none.
• Bounded review rule: both permitted passes ran; no third loop was opened.

Validation: bun test, bun run typecheck, and git diff --check. This public SDK helper exposes only the public Special Situations monitor surface; no internal-only TIKR-style data is included.