v0 plan: AGENTS.md, gate, five task files with given tests, run-plan driver

Tests were run against a private reference implementation: gate ok after every
task in order, smoke ok (stream spread ~1000 ms). The reference is not in the
repository.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/plans/v0/files/internal/config/testdata/bad-default-model.toml

@@ -0,0 +1,9 @@
+listen = "127.0.0.1:7777"
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434"
+models   = { "m" = { } }
+
+[routes.r]
+hosts         = ["alpha"]
+default_model = "not-served"

docs/plans/v0/files/internal/config/testdata/bad-listen.toml

@@ -0,0 +1,8 @@
+listen = "0.0.0.0:7777"
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434"
+models   = { "m" = { } }
+
+[routes.r]
+hosts = ["alpha"]

docs/plans/v0/files/internal/config/testdata/bad-unknown-host.toml

@@ -0,0 +1,8 @@
+listen = "127.0.0.1:7777"
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434"
+models   = { "m" = { } }
+
+[routes.r]
+hosts = ["alpha", "gamma"]

docs/plans/v0/files/internal/config/testdata/bad-unknown-key.toml

@@ -0,0 +1,9 @@
+listen = "127.0.0.1:7777"
+lease_idle = "30m"
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434"
+models   = { "m" = { } }
+
+[routes.r]
+hosts = ["alpha"]

docs/plans/v0/files/internal/config/testdata/good.toml

@@ -0,0 +1,19 @@
+listen        = "100.64.0.9:7777"
+poll_interval = "5s"
+queue_max     = 4
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434/"
+weight   = 2.0
+models   = { "ornith-1.5-35b-a3b" = { parallel = 4 }, "small-9b" = { parallel = 6 } }
+
+[hosts.beta]
+base_url = "https://beta.example:8081"
+models   = { "ornith-1.5-35b-a3b" = { } }
+
+[routes.opencode-a]
+hosts         = ["alpha", "beta"]
+default_model = "ornith-1.5-35b-a3b"
+
+[routes.hermes-x]
+hosts = ["beta"]