Rename init-0.4th..init-9.4th to workload-0.4th..workload-9.4th; fix stale WL-HI/WL-LO doc

These are alternate boot personality capsules, not files doe.4th
dispatches from -- confirmed by reading doe.4th itself (it generates
its own synthetic workload internally, DOE-WORK) and mkcapsule.c
(only the exact filename "init.4th" is special-cased as the active
MAMA_INIT capsule). "workload-N.4th" names them for what they are
without colliding with that reserved name.

Renamed the 10 files (git mv, preserving history) and their own
self-referential header comments (also fixed a pre-existing typo,
"init-4.th" -> "workload-4.4th"), updated capsules/README.md,
capsules/MANIFEST.md (21 references), .claude/CLAUDE.md, and a
tools/mkcapsule.c comment.

Also fixed experiments/bare_metal/README.md's "Adding a Custom
Workload Capsule" section, discovered stale while doing this rename:
it documented a WL-HI/WL-LO dispatch table and a wl_id CSV column
that don't exist anywhere in the current capsules/ tree or doe.4th's
own CSV header -- corrected to describe what's actually there (no
pluggable workload dispatch; a custom workload is run by substituting
it in as the boot's own init.4th).

Verified: mkcapsule --lint clean (35 files, 0 violations), all 3
architectures build with zero new warnings, amd64 boots to zuse)ok>
with an unchanged dict_hash/capsule_hash from every prior boot this
session (0xc8f4b09e36f4fc4a / 0x1ef4939ed32ec1e6) and zero faults.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EXieurDfDSsDFdnSyusuWo

capsules/workload-2.4th

@@ -0,0 +1,75 @@
+
+Block 4506
+
+( TRIANGLE WAVE WORKLOAD - Linear ramp up/down )
+( Randomized amplitude and frequency )
+
+: COMPUTE ( n -- )
+  0 SWAP 0 DO I 7 * + LOOP DROP ;
+
+: RAMP-STEP ( intensity -- )
+  50 * COMPUTE ;
+
+Block 4515
+( Rising edge with random perturbation )
+42 SEED
+: RISING-EDGE ( steps -- )
+  0 DO
+    I 1+
+    90 110 RANDOM 100 */ RAMP-STEP
+    10 80 120 RANDOM 100 */ WAIT
+  LOOP ;
+: FALLING-EDGE ( steps -- )
+  DUP 0 DO
+    OVER I -
+    90 110 RANDOM 100 */ RAMP-STEP
+    10 80 120 RANDOM 100 */ WAIT
+  LOOP DROP ;
+
+Block 4525
+
+( Triangle wave cycles with random amplitude/frequency )
+
+: TRIANGLE-CYCLE ( peak-steps -- )
+  DUP RISING-EDGE
+  FALLING-EDGE ;
+
+: TRIANGLE-WAVE ( cycles peak -- )
+  SWAP 0 DO
+    DUP
+    70 130 RANDOM 100 */
+    TRIANGLE-CYCLE
+  LOOP DROP ;
+
+3 10 TRIANGLE-WAVE
+
+Block 4535
+( Asymmetric triangles - fast rise, slow fall )
+7777 SEED
+: ASYM-TRIANGLE ( -- )
+  8 0 DO
+    I 1+ 80 120 RANDOM 100 */ RAMP-STEP
+    20 WAIT
+  LOOP
+  8 0 DO
+    8 I - 80 120 RANDOM 100 */ RAMP-STEP
+    80 120 RANDOM WAIT
+  LOOP ;
+: RUN-ASYM 4 0 DO ASYM-TRIANGLE LOOP ;
+RUN-ASYM
+
+Block 4545
+
+( Sawtooth variant - all rise, sharp drop )
+
+54321 SEED
+
+: SAWTOOTH ( steps -- )
+  0 DO
+    I 1+ 85 115 RANDOM 100 */ RAMP-STEP
+    15 60 140 RANDOM 100 */ WAIT
+  LOOP
+  50 WAIT ;
+
+: RUN-SAW 3 0 DO 12 SAWTOOTH LOOP ;
+RUN-SAW