tools/capsule-reserved.txt: return freed block ranges -- FABRIC-3.6.md task 0.6

Added 4055-4059 (former common/msg.4th) and 4300-4399 (former
process.4th) as reserved, each noted as freed by this reshuffle's
strip rather than owned by non-capsule infrastructure -- the file's
usual purpose (Artemis's own block usage, etc.). Framed explicitly as
lifted, not permanent, once someone deliberately wants a range back,
per FABRIC-3.5.md SSXVIII.4/XXII.4: freed ranges should be returned
here rather than silently available for a future capsule to reclaim
without anyone noticing.

mkcapsule --lint capsules/ clean, 37 files / 0 violations.
check_reserved_conflicts() -- the hard build-gate that actually reads
this file (tools/mkcapsule.c:974) -- passes clean on a real
`make -f Makefile.starkernel ARCH=amd64 all`, confirming the new
entries don't collide with anything currently baked. Registry/
documentation only, no capsule content touched, so no 3-arch boot run
for this task.

All of Phase 0's strips and documentation corrections (0.1-0.6) are
now done. stadium_conserved() (0.7) and the PLOT/FB-WIDTH/FB-HEIGHT
registration audit (0.8) remain.

Authorized by Captain Bob ("Go for it.").

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tools/capsule-reserved.txt

@@ -21,6 +21,17 @@
 #   2048-3071   volatile ramdrive (capsule_loader.c, KRD_MAX_BLOCKS=1024)
 #   3072+       Artemis's real virtio-blk device (persistent, disk/artemis.img)
 #
-# No ranges reserved yet -- seed this file as Artemis's own actual block
-# usage becomes known (e.g. from block_subsystem.c's BAM/home-blocks
-# fence accounting), rather than guessing.
+# No ranges reserved yet for non-capsule infrastructure (Artemis's own
+# actual block usage becomes known from block_subsystem.c's BAM/
+# home-blocks fence accounting, not guessed) -- but see below for a
+# second, narrower use: recording a block range a capsule strip just
+# freed, so mkcapsule's collision machinery won't let a future capsule
+# silently reclaim it before a human decides to (FABRIC-3.5.md SXXII.4,
+# SXVIII.4). These are lifted, not permanent, once someone deliberately
+# wants the range back.
+
+# Freed 2026-09-19 by the Tripod/kernel reshuffle's Category A surgical
+# strip (FABRIC-3.6.md tasks 0.2/0.3; see capsules/MANIFEST.md's
+# "Deleted capsules" section for the full account):
+4055-4059 formerly common/msg.4th -- deleted, block content confirmed dead by all three FABRIC-3.5.md SXXII.2 routes
+4300-4399 formerly process.4th -- deleted, block content confirmed dead by all three FABRIC-3.5.md SXXII.2 routes