bootstrap: SCI core deps loading with 284/304 forms passing

reader: #?@ empty splice fix (nil→@[]), #? nil→:jolt/skip, map reader handles #_/#?@ in K/V
evaluator: unwrap-meta-name helper, deftype interns ->Name too, dot-suffix fix
core: comment/prefer-method stubs, *unchecked-math*/*clojure-version* dynamic vars

.dirge/skills/jpm-build/SKILL.md

@@ -0,0 +1,56 @@
+---
+name: jpm-build
+description: Build and debug Janet projects using jpm. Covers project.janet structure, common build errors, and native compilation with create-executable.
+---
+
+# JPM Build & Debug
+
+## Build Commands
+
+```bash
+jpm build       # Compile and link executable → build/jolt
+jpm test        # Run all tests
+jpm deps        # Show dependencies
+```
+
+## project.janet Structure
+
+```janet
+(declare-project
+  :name "jolt"
+  :description "...")
+
+(declare-source
+  :source @["src"])          # Source directories
+
+(declare-executable
+  :name "jolt"               # Output binary name
+  :entry "src/jolt/main.janet")  # RELATIVE TO PROJECT ROOT, not source dirs
+```
+
+## Common Pitfalls
+
+### Entry path is relative to project root
+Even though `declare-source` lists `@["src"]`, the `:entry` in `declare-executable` must include `src/` prefix. jpm's `create-executable` calls `dofile source` with the raw entry string.
+
+### main function required for native compilation
+`create-executable` extracts a `main` function from the entry file's environment. Top-level code runs during `dofile` and interferes with image generation. Error: "expected integer key for keyword in range [0, 5), got nil".
+
+**Fix:** Wrap startup code in `(defn main [&] ...)`.
+
+```janet
+(defn main [&]
+  (print "REPL started")
+  ;; ... REPL loop ...
+)
+```
+
+### LSP false positives
+Clojure LSP misidentifies `.janet` files. Ignore all diagnostics — they don't affect build or test results.
+
+## Debugging Build Failures
+
+1. Check entry path includes `src/` prefix
+2. Check entry file has `(defn main [&] ...)` wrapping top-level code
+3. Run `jpm test` to verify code works before native compilation
+4. `jpm build` produces no output on success — check exit code only