Release notes + changeset for 1.4.19

[RhysSullivan]

Summary

• Adds .changeset/executor-1.4.19.md (patch) so the next Version Packages PR cuts CLI v1.4.19.
• Replaces the stale 1Password content in apps/cli/release-notes/next.md (already shipped in v1.4.18) with curated notes for the three PRs landed since:
  • fix: keep executor.jsonc in sync with source add/remove #408 — removeSource write-back to executor.jsonc for openapi/mcp/graphql, plus boot-replay auth threading for remote MCP sources (@RyanNg1403)
  • fix(executor): repair MCP auth round-trip across config-sync #709 — MCP updateSource write-back so UI auth changes survive a restart, plus credentialTargetScope threading on boot replay (@aryasaatvik)
  • Fix crash on variadic tool path arguments #761 — CLI no longer crashes on variadic positional path args (@grfwings)

Test plan

• bun run lint:release-notes
• bun run lint:changelog-stubs
• oxfmt --check on touched files
• Reviewer: confirm release notes copy matches user-visible behavior of fix: keep executor.jsonc in sync with source add/remove #408, fix(executor): repair MCP auth round-trip across config-sync #709, Fix crash on variadic tool path arguments #761

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commit: 953e7b4