release: bump to 0.14.2

[cardmagic]

Documentation-only release. No runtime code changed.

Why now

The package ships README.md and docs/ inside the tarball, and npmjs.com
renders that README. The fix for #22 merged in #27, but published 0.14.1 still
shows the broken guidance:

published 0.14.1 README:  const cart = runtime.ref(Cart, "cart-123")
                          "installs and then waits" → 0 occurrences

That is the exact page the external prober read before concluding messages
were stranded, so leaving it unpublished leaves the report unaddressed for
anyone arriving through npm. The gem does not have this gap: solid_objects
0.14.1 shipped its equivalent docs fix on RubyGems.

What ships

• The run(signal) statement in README.md and docs/operations.md (docs: state that background pickup requires runtime.run(signal) #22).
• The model example built with configure() and addressed as
  Cart.ref("cart-123"), which is the form that actually runs.
• examples/at-least-once and pnpm run test:at-least-once (examples: make the at-least-once duplicate observable at a sink with dedup off #23).

Verified in the packed tarball rather than the working tree:

README: "installs and then waits" → 1
README: const cart = Cart.ref("cart-123")
docs/operations.md: "starts nothing" → 1
package.json: "version": "0.14.2"

Validation

Full release gate list from docs/releasing.md, all passing locally:
format:check, check, test:coverage, build, pack:check,
test:package, test:recovery, test:at-least-once,
pnpm audit --audit-level=high (no known vulnerabilities), and
test:browser (9 passed). The PostgreSQL, MySQL, and Redis matrices run here
in CI.

[greptile-apps]

Greptile Summary

This release-only PR publishes the documentation and example improvements already merged for version 0.14.2.

• Updates package and runtime version constants from 0.14.1 to 0.14.2.
• Promotes the pending changelog entries into the dated 0.14.2 release section.

Confidence Score: 5/5

The PR appears safe to merge with all release version identifiers synchronized.

The package version, exported runtime version, and changelog release heading agree on 0.14.2, and no runtime logic or security boundary changes.

Important Files Changed

Filename	Overview
CHANGELOG.md	Promotes the existing unreleased notes to the dated 0.14.2 release section; no actionable issue found.
package.json	Updates the npm package version to 0.14.2 consistently with the release metadata.
src/version.ts	Updates the exported runtime version to 0.14.2, matching package.json.

_{Reviews (1): Last reviewed commit: "release: bump to 0.14.2" | Re-trigger Greptile}