Org migration: tag v0.3.0 across all modules

[zeevdr]

Description

After all migration work is done, tag the first release under the new org. This is v0.3.0 — clean break from the zeevdr-era tags.

Tags to create (decree repo)

• `v0.3.0` (root)
• `api/v0.3.0`
• `sdk/configclient/v0.3.0`
• `sdk/adminclient/v0.3.0`
• `sdk/configwatcher/v0.3.0`
• `sdk/tools/v0.3.0`
• `cmd/decree/v0.3.0`

Other repos

• decree-python: tag `v0.2.0` (bumps from 0.1.0, update version in pyproject.toml)
• decree-typescript: tag `v0.2.0` (bumps from 0.1.0, update version in package.json)
• decree-ui: tag `v0.2.0` (bumps from 0.1.0)

Depends on

• Org migration: update Go module paths (zeevdr → opendecree) #171, Org migration: update Docker images and registry paths #172, Org migration: reconfigure CI/CD across all repos #173, Org migration: update Python and TypeScript SDK package metadata #174, Org migration: update all documentation and agent context #175 (all migration work complete)
• CI passing on all repos

Acceptance criteria

• `go install github.com/opendecree/decree/cmd/decree@v0.3.0` works
• All SDK modules resolvable via `go get`
• Docker images tagged and pushed
• GitHub Release created with changelog

[zeevdr]

Completed — migrated to opendecree org.