Phase 1+2: Clojure→Janet source compiler with symbol classification

- analyze-form: Clojure forms → annotated AST nodes (:op keys)
- emit-ast: AST dispatch → Janet source via StringBuffer
- compile-form: analyze → emit → Janet source string
- Symbol classification: locals, core refs, qualified refs
- Ops: const, do, if, def, fn, let, invoke, quote, vector, map
- Local binding awareness in fn* and let* (shadowing works)
- All 317 existing tests pass, 24 new compiler tests

.dirge/skills/.usage.json

@@ -1,34 +1,43 @@
 {
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.dirge/skills/jolt-compiler/SKILL.md

@@ -0,0 +1,82 @@
+---
+description: Jolt compiler architecture and implementation plan
+---
+
+# Jolt Compiler
+
+Two-phase source-to-source compiler: Clojure forms → annotated AST → Janet source → Janet bytecode.
+
+## Architecture
+
+```
+Clojure source → Reader → raw AST
+                            ↓
+                   analyze-form (classify symbols, produce :op AST)
+                            ↓
+                   emit* dispatch (generate Janet source string)
+                            ↓
+                   Janet compile → bytecode
+```
+
+Follows CLJS `cljs.analyzer` / `cljs.compiler` pattern.
+
+## Key decisions
+
+- **Target**: Janet source text (fed to Janet's `compile`), not direct bytecode. Simpler, debuggable, portable across Janet versions.
+- **Mode gating**: Opt-in per context via `:compile?` flag on `init`. `eval-string` still interprets unless opted in.
+- **Caching**: In-memory bytecode cache in context first. Disk persistence (`.jimage` files) as follow-up.
+
+## AST ops (CLJS subset + Jolt-specific)
+
+Core: `const`, `var`, `local`, `binding`, `if`, `do`, `let`, `loop`, `recur`, `fn`, `fn-method`, `def`, `invoke`, `quote`, `try`, `throw`, `set!`, `new`, `host-field`, `host-call`
+
+Jolt-specific: `deftype`, `defmulti`, `defmethod`, `syntax-quote`
+
+## File layout
+
+| File | Purpose |
+|------|---------|
+| `src/jolt/compiler.janet` | `analyze-form`, `emit*` dispatch, `compile-form`, symbol classifier |
+| `src/jolt/loader.janet` | `load-ns`, `reload-ns`, in-memory bytecode cache |
+| `test/compiler-test.janet` | Round-trip: compile-form → Janet eval → assert |
+
+Modified files:
+- `evaluator.janet` — add compiler fast-path for `def`/`defn`/`defmacro` when `:compile?` set
+- `types.janet` — add `:compiled-cache` table to context
+- `api.janet` — expose `compile-string`, `load-ns`, `compile-file`; `init` gets `:compile?` flag
+- `reader.janet` — **no change**
+- `core.janet` — **no change**
+
+## Emit target advantages
+
+Both input and output are parenthesized prefix syntax, so many forms pass through almost unchanged:
+
+```
+Clojure:  (defn f [x] (+ x 1))
+AST:      {:op :def :name "f" :init {:op :fn :methods [...]}}
+Janet:    (defn f [x] (+ x 1))          ← nearly identical
+```
+
+Main work:
+- Symbol resolution (Clojure's `clojure.core/+` → Janet's `core-+`)
+- Truthiness wrapping (`nil`/`false` are falsey in Clojure, Janet only `nil`)
+- Special form mapping (`loop*`/`recur` → Janet `loop` + explicit recur vars)
+- Vars → Janet table lookups
+
+## Implementation phases
+
+| Phase | What | Deliverable |
+|-------|------|-------------|
+| 1 | `compiler.janet` — `analyze-form` skeleton + `emit*` for `const`, `do`, `if`, `let`, `fn`, `def`, `invoke` | Basic forms compile and run |
+| 2 | Symbol classifier — resolve locals/vars/core at analyze time | No runtime `resolve-sym` in compiled code |
+| 3 | `loader.janet` + `api.janet` wiring — `:compile?` flag, `load-ns`, caching | File-based namespace loading works |
+| 4 | Macro integration — expand at analyze time via interpreter | Macros work in compiled code |
+| 5 | Remaining ops: `loop`/`recur`, `try`/`throw`, `quote`, `syntax-quote`, `set!`, `deftype`, `.` | Full language coverage |
+| 6 | Tests + benchmarks | Correctness + speedup measurement |
+
+## Pitfalls
+
+- Janet `compile` produces bytecode tied to Janet version — source-to-source avoids this
+- CLJS analyzer is ~5000 lines; Jolt's can be simpler because emit target is s-expressions
+- Symbol resolution must happen at analyze time, not runtime, for compiled code
+- Macro expansion still uses interpreter at analyze time — macros are not AOT-compiled