feat: publish Tend v0.2 preview source

Publish the reviewed allowlisted snapshot whose exact binary completed maintenance deployment, rollback, and reactivation exercises for Gamertan and Sandwich Hime.

Private-Source-Commit: 4d7094c8b7c61991bfb67b11fc1558724c874eb2

Private-Source-Tree: 54a2f74804f7acddf3755d7d4da5b97f5fc28381

AI-Assistance: OpenAI Codex assisted implementation, testing, security review, and release verification.
Signed-off-by: Cole Speelman <crspeelman@gmail.com>

docs/DOGFOOD_EVIDENCE.md

@@ -4,6 +4,85 @@ This is maintainer-run operational evidence, not an independent audit or a
 general reliability claim. It records the acceptance campaign completed on
 August 14, 2026 before Tend's first public preview.
 
+## Restricted multi-service campaign — August 16, 2026
+
+Tend's v0.2 implementation candidate completed the same maintenance contract
+through the restricted transport for two independently configured services on
+one Linux/systemd/Caddy host.
+
+### Assessed Tend implementation
+
+- Implementation source commit:
+  `840b77da708bbcd87a3203fb6a1f99b2984b8667`.
+- Linux/amd64 candidate binary SHA-256:
+  `b3961315288871fa6085bf3b75c784a825a88f2bc3dd0694ad5d6c590eddf895`.
+- Candidate archive SHA-256:
+  `948bad5271dca08b9445c387c5aea7f58f22add6b47b9071e1801a756aa71259`.
+- Toolchain: Go 1.26.6, `CGO_ENABLED=0`, `-trimpath`.
+- Trusted Gitea verification run 119 and release-candidate run 120 passed for
+  the exact implementation commit. CI and an independent, network-disabled
+  build each produced the same archive digest twice.
+- The installed receiver accepted only a pinned Ed25519 host key, a dedicated
+  forced-command deployment key, the exact `tend-receive-v1` protocol, two
+  allowlisted service names, and separately repeated artifact digests. An
+  attempted arbitrary SSH command was refused.
+- Production source, Go caches, repository credentials, secret values, remote
+  paths, and shell commands did not cross the transport boundary.
+
+Adding this evidence changes VCS build metadata but not executable logic. The
+signed preview tag and attached release evidence therefore identify the final
+evidence-bearing candidate and its required last maintenance pass.
+
+### Gamertan blue-green campaign
+
+- Application source commit:
+  `a7e54047d3dc11671824b6ecc8ed698a9dd04421`.
+- Preview 27 artifact SHA-256:
+  `edadef3a97c089771e2b6bb7dadd58928762284878f76f23b112c61ae282f17f`.
+- The artifact was built twice, byte-identically, in the pinned Go 1.26.6
+  image with networking disabled and the audited cached module graph.
+- The inactive slot passed health, readiness, page-marker, Caddy validation,
+  public-origin, Sandwich Hime mount, and EQL continuity checks before traffic
+  moved.
+- Explicit rollback restored preview 26; its readiness and public boundary
+  passed; preview 27 was then reactivated through the recorded state.
+- Sandwich Hime's release pointer and service remained unchanged throughout.
+
+### Sandwich Hime singleton campaign
+
+- Application source commit:
+  `435880c6751b773b6c5ee3ae6833d26e8eb7c0df`.
+- Preview 30 artifact SHA-256:
+  `bee8d5bcde2c3c2e8bb96d5909a19889fc7f0be9390046c243fe20c9ff2ca44b`.
+- The artifact was built twice, byte-identically, in the same pinned,
+  network-disabled Go 1.26.6 environment.
+- A transient DynamicUser candidate passed health, readiness, tutorial marker,
+  canonical-origin, and Gamertan-mounted checks before the singleton pointer
+  and installed service changed. The candidate port was released afterward.
+- Explicit rollback restored preview 28; its readiness and public boundary
+  passed; preview 30 was then reactivated through the recorded state.
+- Both Gamertan slots, its selected Caddy upstream, and EQL remained healthy.
+
+### Findings resolved by dogfood
+
+The first restricted transfer stopped before artifact validation because
+`sudo` removed `SSH_ORIGINAL_COMMAND`. The forced account still refused the
+request; no service state changed. The 0BSD sudoers template now preserves only
+that one server-supplied variable, while the receiver requires its exact
+protocol value and rejects every other command.
+
+The first singleton candidate stopped before pointer mutation because the
+shared environment file's live listen value overrode the candidate address.
+The site remained on its former release and retained the same process. Tend now
+rejects singleton shared environment files containing the configured listen
+key; installed units own the non-secret live address and Tend supplies only the
+transient candidate address.
+
+Final verification found both service states valid, every installed unit and
+Caddy active with zero restart failures, the candidate port closed, no warning
+or error entries after the successful campaign, and representative Gamertan,
+Sandwich Hime, mounted, and EQL routes returning HTTP 200.
+
 ## Assessed candidate
 
 - Source commit: `306d085e518cb4fe7b20a66d1e2ceb171e54ebdc`.