feat: build system transition to release fork + archive hardening

Release fork infrastructure:
- REDBEAR_RELEASE=0.1.1 with offline enforcement (fetch/distclean/unfetch blocked)
- 195 BLAKE3-verified source archives in standard format
- Atomic provisioning via provision-release.sh (staging + .complete sentry)
- 5-phase improvement plan: restore format auto-detection, source tree
  validation (validate-source-trees.py), archive-map.json, REPO_BINARY fallback

Archive normalization:
- Removed 87 duplicate/unversioned archives from shared pool
- Regenerated all archives in consistent format with source/ + recipe.toml
- BLAKE3SUMS and manifest.json generated from stable tarball set

Patch management:
- verify-patches.sh: pre-sync dry-run report (OK/REVERSED/CONFLICT)
- 121 upstream-absorbed patches moved to absorbed/ directories
- 43 active patches verified clean against rebased sources
- Stress test: base updated to upstream HEAD, relibc reset and patched

Compilation fixes:
- relibc: Vec imports in redox-rt (proc.rs, lib.rs, sys.rs)
- relibc: unsafe from_raw_parts in mod.rs (2024 edition)
- fetch.rs: rev comparison handles short/full hash prefixes
- kibi recipe: corrected rev mismatch

New scripts: restore-sources.sh, provision-release.sh, verify-sources-archived.sh,
check-upstream-releases.sh, validate-source-trees.py, verify-patches.sh,
repair-archive-format.sh, generate-manifest.py

Documentation: AGENTS.md, README.md, local/AGENTS.md updated for release fork model

local/patches/base/P2-daemon-ready-graceful.patch

@@ -1,23 +0,0 @@
-# P2-daemon-ready-graceful.patch
-#
-# Replace unwrap() in Daemon::ready() with graceful error handling.
-# When hwd or pcid-spawner spawns a daemon fire-and-forget (dropping the
-# pipe's read end before the child signals readiness), the unwrap() causes
-# a BrokenPipe panic that kills the child and cascades into boot failures.
-#
-# The write may fail because init already closed the read end (service
-# timeout, duplicate start, or oneshot completion). In all cases the
-# daemon should continue running rather than panic.
-
-diff --git a/daemon/src/lib.rs b/daemon/src/lib.rs
---- a/daemon/src/lib.rs
-+++ b/daemon/src/lib.rs
-@@ -51,7 +51,7 @@ impl Daemon {
- 
-     /// Notify the process that the daemon is ready to accept requests.
-     pub fn ready(mut self) {
--        self.write_pipe.write_all(&[0]).unwrap();
-+        let _ = self.write_pipe.write_all(&[0]);
-     }
- 
-     /// Executes `Command` as a child process.