Merge sentry-cli + sentry-mcp into getsentry/toolkit monorepo (master)

[BYK]

Master: merge sentry-cli + sentry-mcp into getsentry/toolkit monorepo

Tracking issue for merging getsentry/cli and getsentry/sentry-mcp into a
single getsentry/toolkit pnpm-workspace monorepo (no Turbo), with
independent prefixed releases and shared core code.

Full plan: https://gist.github.com/BYK/8c0ce6cec64608f41fe5654b7827228e

Approach (settled)

• Rename getsentry/sentry-mcp -> getsentry/toolkit (NOT a fresh repo) to
  preserve MCP's production secrets/environments/App-install/Cloudflare wiring.
• git subtree import the CLI (this repo) after pre-shaping it — two
  prefixes (packages/cli/, apps/cli-docs/), history preserved.
• Prefixed independent releases: cli@x.y.z / mcp@x.y.z.
• CLI docs -> release-gated Cloudflare (off GitHub Pages; not Vercel).
• Drop Turbo for pnpm-native orchestration (graph derived from workspace: deps).
• Patches root-managed, bump @sentry/* to catalog 10.54.0.
• Code sharing phased: colocate first, extract @sentry/toolkit-core later.

Sub-tasks (this repo)

• toolkit merge: pre-shape CLI into packages/cli + apps/cli-docs #1238 — pre-shape CLI into packages/cli + apps/cli-docs
• toolkit merge: two-prefix subtree import of CLI into toolkit #1239 — two-prefix subtree import of CLI into toolkit
• toolkit merge: unify toolchain + root patches (bump @sentry/* to 10.54.0) #1240 — unify toolchain + root patches (bump @sentry/* to 10.54.0)
• toolkit merge: drop Turbo, pnpm-native orchestration #1241 — drop Turbo, pnpm-native orchestration
• toolkit merge: per-product CI with changed-file gating #1242 — per-product CI with changed-file gating
• toolkit merge: prefixed independent releases (cli@ / mcp@) #1243 — prefixed independent releases (cli@ / mcp@)
• toolkit merge: CLI dual-source upgrade + install-script parity #1244 — CLI dual-source upgrade + install-script parity (highest risk)
• toolkit merge: CLI docs website to release-gated Cloudflare #1245 — CLI docs website to release-gated Cloudflare
• toolkit merge: verification + cutover #1246 — verification + cutover
• toolkit merge: Phase B — extract @sentry/toolkit-core (shared code) #1247 — Phase B: extract @sentry/toolkit-core

Cross-repo tasks

• Rename sentry-mcp -> getsentry/toolkit and prep for CLI monorepo merge sentry-mcp#1156 — rename repo, add apps/* glob, drop Turbo on the live deploy path
• Support Cloudflare deploy target + prefixed multi-product releases (for getsentry/toolkit) craft#842 — Cloudflare deploy target + prefixed multi-product release support

Key risks

• toolkit merge: CLI dual-source upgrade + install-script parity #1244 CLI self-upgrade compat: old binaries have getsentry/cli baked in — needs dual-source fallback + dual-publish window.
• toolkit merge: drop Turbo, pnpm-native orchestration #1241 / sentry-mcp#1156 dropping Turbo edits MCP's production deploy path — canary-verify before merge.