feat(mavweb): /ecosystem page consuming Nexus/Praxis/Hexis + shell fixes

Add a read-only /ecosystem page that consumes the sibling services'
JSON APIs (Nexus entities, Praxis attention, Hexis capabilities),
fetched concurrently with honest per-panel error states. Siblings stay
headless — mavweb is their human surface (arch §16). Wired via mavweb
-nexus/-praxis/-hexis flags; mavweb joins the ecosystem compose network.

Fix mobile horizontal overflow across all pages: .content is a flex
child with default min-width:auto, so it refused to shrink below the
tables' intrinsic width. min-width:0 lets wide tables pan inside .scroll
instead of dragging the page sideways. Verified via CDP geometry check
(scrollWidth === clientWidth at 430px).

Also includes in-progress Ethos UI redesign, ecosystem deploy compose,
and planning docs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

START.md

@@ -41,7 +41,7 @@ Config path: `~/.config/maven/mavend.json`. Full example with all options:
     "topic": "maven"
   },
   "phraser": {
-    "model_path": "/mnt/hdd1/llms/LFM2.5/LFM2.5-1.2B-Instruct-Q4_K_M.gguf",
+    "model_path": "/mnt/hdd1/llms/Qwen3-Maven-1.7B-Q8_0.gguf",
     "bin_path": "/usr/local/bin/llama-server",
     "n_gpu_layers": -1
   },