phase 4: remove run/architect/scaffold/login from @stackbilt/cli at Charter 1.0

[stackbilt-admin]

Phase 4 of RFC #112 — final removal of the commercial surface from @stackbilt/cli at Charter 1.0.

Context

• Phase 1 (env-var bridge): shipped in feat(cli): STACKBILT_API_KEY env var auth; deprecate charter login #111.
• Phase 2 (stand up @stackbilt/build): prerequisite.
• Phase 3 (stronger deprecation notice): prerequisite — notice must ship for ≥1 minor release cycle before removal so consumers are warned.

Scope — deletions

From packages/cli/src/:

• commands/{login,architect,run,scaffold}.ts
• credentials.ts
• http-client.ts
• types/scaffold-contract-types.ts

From packages/cli/src/__tests__/:

• credentials.test.ts, login.test.ts, auth-wiring.test.ts

From packages/cli/package.json:

• Remove the stackbilt bin alias (pending Open Q fix: cross-platform parity (ADX-005), bump v0.5.0 #2 on RFC: Extract commercial surface from @stackbilt/cli into @stackbilt/build #112 — keep as grace shim vs. remove outright).

From root README.md:

• Remove the deprecated Build section entirely.

Acceptance criteria (mirror of RFC #112's 1.0 checklist)

• grep -r 'fetch(' packages/cli/src/ returns zero results (aside from test fixtures).
• grep -r 'Authorization' packages/cli/src/ returns zero results.
• No stackbilt.dev URL literals in @stackbilt/cli source.
• packages/cli/package.json bin field contains only { "charter": "./dist/bin.js" } (pending Open Q fix: cross-platform parity (ADX-005), bump v0.5.0 #2).
• credentials.ts, http-client.ts, scaffold-contract-types deleted.
• CHANGELOG [1.0.0] entry documents the split and upgrade path to @stackbilt/build.
• Major version bump.

Blocked on

• Phase 2 — receiving package @stackbilt/build published.
• Phase 3 — deprecation notice shipped for ≥1 minor release cycle.
• Open Q fix: cross-platform parity (ADX-005), bump v0.5.0 #2 — bin-alias grace shim decision (keep stackbilt bin for one release as a warning shim, or remove immediately?).
• Open Q fix(bootstrap): on-demand ADF modules missing after bootstrap completes #4 — Charter 1.0 timing (no urgency signal from telemetry; land when governance commands feel stable).

References

• RFC RFC: Extract commercial surface from @stackbilt/cli into @stackbilt/build #112 (parent umbrella)
• Phase 1: feat(cli): STACKBILT_API_KEY env var auth; deprecate charter login #111
• Phase 2: stand up @stackbilt/build
• Phase 3: stronger CLI deprecation notice