docs: sync Mintlify guides with pymthouse 0.3.2 Builder API

[eliteprox]

Summary

Updates integrator docs to match the latest pymthouse Builder API contract (docs/builder-api.md, app version 0.3.2).

Prior Mintlify pages still documented pre-cleanup surfaces (pmth_ak_*, POST .../auth/api-key/*, app-level /keys, GET /auth/validate) that 0.3.x removed.

Key changes

• Credentials: document pmth_<hex>, presented app_<clientId>.pmth_<hex>, and pmth_cs_* (drop nonexistent pmth_ak_*)
• SignerSession exchange: canonical path is POST /api/v1/apps/{clientId}/oidc/token (RFC 8693); Basic optional when subject_token is an API key
• Removals / migrations: full breaking-changes table including auth/api-key/*, app-level keys, GET validate, BFF keys/exchange
• OpenAPI: document GET /api/v1/openapi.json and Scalar GET /api/v1/docs
• Related: external_user_id JWT claim, Stripe-not-required-for-Starter note, README org link → pymthouse/pymthouse

Files touched

integration/api-keys, client-model, token-exchange, user-management, sdk, signer-routing, deprecated, user-tokens, billing, manifest, plus api-reference/introduction, index, README

Verification

• npm run validate — build validation passed

  

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