feat: Icons are now loaded from templates (no longer baked-in).

AGENTS.md

@@ -5,9 +5,9 @@ Thor is a static site generator written in [Odin](https://odin-lang.org), replac
 ## Architecture
 
 ```
-thor.json          ← site config (title, base_url, social, author)
+thor.json          ← site config (title, base_url, author, params)
 content/           ← markdown and HTML content files
-layouts/           ← Mustache templates
+layouts/           ← Mustache templates + partials
 assets/            ← CSS (TailwindCSS source) and JS
 public/            ← build output (generated)
 ```
@@ -23,11 +23,12 @@ public/            ← build output (generated)
 | `footnotes.odin` | Footnote definition stripping (pre-cmark) + sidenote injection (post-cmark) |
 | `alerts.odin` | GitHub alert post-processor (`> [!CAUTION]` → styled blockquote) |
 | `emoji.odin` | Emoji shortcode expander (`:shrug:` → `¯\_(ツ)_/¯`) |
-| `render.odin` | Mustache template rendering, all page types, RSS, sitemap, robots.txt |
+| `render.odin` | Mustache template rendering, all page types, RSS, sitemap, robots.txt, `load_partials` recursive scan |
 | `feed.odin` | RSS feed + sitemap XML generation |
-| `icons.odin` | Inline SVG icon constants (home, github, rss, chevron-up, star) |
 | `mustache/` | Vendored [odin-mustache](https://github.com/benjamindblock/odin-mustache) library |
 
+Icon SVGs live as HTML partials in `layouts/partials/icons/` (home, github, rss, chevron_up, star).
+
 ### Data flow
 
 ```
@@ -38,6 +39,27 @@ content/ → walk_content → []Page (with body_html from cmark pipeline)
 layouts/*.html → render_site (Mustache render_in_layout) → public/
 ```
 
+### Config system
+
+`Site` has `params: json.Value` for arbitrary user-defined data from `thor.json`. Social links and other template-only data live under `"params"`:
+
+```json
+{
+  "title": "...",
+  "base_url": "...",
+  "author": "...",
+  "params": {
+    "social": [
+      { "name": "github", "url": "...", "icon": "icons/github" }
+    ]
+  }
+}
+```
+
+Templates access params via dotted keys: `{{#params.social}}`, `{{>* icon}}`.
+
+Config precedence: `CLI flags > thor.json values > hardcoded defaults`.
+
 ### Markdown pipeline (in content.odin `load_page`)
 
 ```
@@ -54,24 +76,12 @@ raw markdown
 ### Memory management
 
 - `Site` owns a `mem.Dynamic_Arena`
-- `init_site` calls `mem.dynamic_arena_init` before any allocation
+- `init_site` calls `mem.dynamic_arena_init(&site.arena, alignment = 64)` — the 64-byte alignment is required by Odin's map runtime (`MAP_CACHE_LINE_SIZE`)
 - Config loading (flags + JSON) uses the arena allocator explicitly
 - `site_allocator(site)` returns the arena allocator for callers
 - `destroy_site` frees the arena
 - **Not yet wired:** `context.allocator` is not set to the arena in `main.odin`, so rendering and content processing still use the heap allocator
 
-### Config precedence
-
-```
-CLI flags > thor.json values > hardcoded defaults
-```
-
-`init_site` handles this flow:
-1. Parse flags into a temp `Site` struct
-2. Load `thor.json` (if exists)
-3. `site_merge` — CLI overrides config values
-4. Hardcoded defaults fill remaining gaps (relative to config file's directory)
-
 ## Building
 
 ### Local development
@@ -96,23 +106,29 @@ nix build  # runs thor + tailwindcss + cp js, outputs to ./result/
 ```bash
 cd thor
 odin test .           # site + mustache smoke tests
-odin test . -all-packages  # also runs mustache spec tests
+odin test mustache    # mustache spec + targeted tests (37 total)
 ```
 
 ## Vendored mustache patches
 
-Two modifications to `mustache/mustache.odin`:
+Four modifications to `mustache/mustache.odin`:
 
 1. **`any` unwrapping** in `map_get` and `data_type` — when values come from `map[string]any`, the inner `any` wrapper is unwrapped so type detection works correctly for nested maps and lists.
 
 2. **Layout partials** — `layout_template.partials = tmpl.partials` added so partials (`{{> nav}}`, `{{> footer}}`) work inside the base layout template.
 
+3. **Inline partial rendering** — replaced `template_insert_partial` (which injected tokens into the main token list, breaking section iteration) with `template_render_partial` (which lexes the partial, temporarily swaps `tmpl.lexer`, and recursively processes via `template_process_tokens`). Fixes partials inside sections.
+
+4. **Dynamic Names** — `{{>*key}}` support. When a partial token value starts with `*`, the remaining key is resolved from the data context stack, and the resolved string is used as the partial name. Enables per-item partial selection inside sections (e.g., `{{>* icon}}` resolves `icon` from each social link).
+
+Extracted `template_process_tokens` from `template_eat_tokens` to separate ROOT initialization + skip pass from the core token loop, allowing partials to reuse the loop.
+
 ## Known limitations
 
-- Partials inside Mustache sections (`{{#list}}...{{> partial}}...{{/list}}`) produce duplicate items — library token insertion bug. Workaround: inline the markup.
 - cmark allocates via C malloc, not the arena. HTML output leaks until process exit.
 - CSS/JS cache busting uses manual `?v=N` query params instead of content hashing.
 - The `shrug` emoji has a backslash that may not display correctly.
+- `json.Value` params require 64-byte aligned arena (workaround for `dynamic_arena_allocator_proc` ignoring per-allocation alignment).
 
 ## TODO