Fix -m arg drop under whole-program cache (jolt-4mui) + RFC 0003 sync (#138)

* Bind *command-line-args* after the deps-image cache swap (jolt-4mui)

Under whole-program (deps-image cache active), `jolt -m NS ARG` dropped ARG:
run-main set *command-line-args* on the current ctx, but a cache HIT then
replaced ctx with the saved image (via `set ctx cached`), whose *command-line-
args* was whatever got baked when the image was saved. The stale binding won at
`(apply NS/-main *command-line-args*)`, so -main ran with the wrong (usually
default) args — silently, for any optimized -m program.

Move set-command-line-args to AFTER the cache swap so it binds on the final ctx.
Repro/regression in deps-cache-args-test.janet: first run builds the image
(arg "first"), second run (cache hit) must echo "second", not the baked "first".

* docs: RFC 0003 — phm is a HAMT, sorted colls a red-black tree

The transients RFC described phm as "bucket-based copy-on-write" and mused about
"if it ever becomes a HAMT" — it is one now (jolt-684u), and sorted maps/sets are
a red-black tree (jolt-0hbr). Update the deviation/future-work notes accordingly.

---------

Co-authored-by: Yogthos <yogthos@gmail.com>

docs/rfc/0003-transients.md

@@ -53,7 +53,7 @@ are identical (O(n) total either way) with a better constant in the loop and a
 worse constant at the two edges. The pattern transients exist for — batch
 construction — is fully served. What is NOT served is transient-editing a
 *large* collection to change a few keys: that's O(n) in Jolt vs O(log n) in
-Clojure, because `transient` flattens the pvec trie / phm buckets into a
+Clojure, because `transient` flattens the pvec trie / phm HAMT into a
 native array/table and `persistent!` rebuilds them.
 
 **No thread-ownership check.** JVM Clojure ≥1.7 also dropped the owner-thread
@@ -110,7 +110,9 @@ tiers as ordinary migration batches.
 - pvec is already a 32-way trie with structural sharing (pv.janet), so
   Clojure-style O(1) `transient`/`persistent!` via editable nodes is a real
   option for vectors — an internal change behind the same surface, not a
-  semantics change. phm is bucket-based copy-on-write; the same trick applies
-  if it ever becomes a HAMT.
+  semantics change. phm is now a HAMT with structural sharing too (jolt-684u),
+  and sorted maps/sets are a red-black tree (jolt-0hbr), so the same editable-
+  node trick is open for those as well — the transient surface here is still the
+  copy-to-native-table flatten.
 - `transient?` (Jolt extension, useful in tests) stays; Clojure has no public
   predicate, so it must not leak into portability-sensitive code.