Sidecat 0.1.0 source preview NOT RECOMMENDED FOR USE. This is Sidecat's first tagged source preview and a historical baseline for the Functional 0.1.0 reorientation. It records the 0.1.0 version identity, MIT license decision, source-only release policy, and deliberate release-documentation guardrail update before the project moves quickly through cleanup and the Starlark-centered redesign work. This release is source-only. It is the annotated Git tag v0.1.0 plus the source archives GitLab provides for that tag. This is not a production runtime, stable command surface, hosted service, complete AAuth implementation, complete federation implementation, complete Sidebar/Sidebird product, packaged distribution, signed binary artifact, SBOM-backed release, or provenance-backed binary release. Verification before corrected tagging: go vet ./..., go test -count=1 -race ./..., make build, SIDECAT_FUZZTIME=8s scripts/check-fuzz-smoke.sh, SIDECAT_BENCHTIME=200x scripts/check-perf-smoke.sh, the multi-process reopen smoke, AAuth mission-flow smoke, work-model walkthrough smoke, 0.1.0 local-operator preview gate, deferral/capability status checks, 0.0.2/0.0.3/0.0.4 corpora, M0 language validation, scripts/check-doc-count.sh, and git diff --check passed on commit 76e31e720d94dc5b87a725792be9d1f45e7443d3. Release hygiene note: an initial v0.1.0 tag was created at 998c354e6776bfeb0a2be12e555a59b7bfbe2355, but CI correctly failed because adding RELEASES.md crossed the Markdown-count guardrail without a deliberate ceiling update. Before treating the release as complete, the GitLab release/tag was replaced with this corrected tag at 76e31e720d94dc5b87a725792be9d1f45e7443d3.