Bootstrap: refresh gen-0 sidecar stamp + spine footnotes (4183/4184)

[PurHur]

Summary

• Refresh prelinked/bootstrap-gen0/.m3_compiler_lib_sidecar.sha to match current spine entry SHA after php-in-php: class_implements() JIT via ClassImplementsJitHelper PHP (#16960) #16964/AOT: localize cached-unit declaration types + call-site-lazy sprintf link; workflow skills (#15642, #15889) #16965 require_once additions.
• Update manifest.json generated_at via make bootstrap-gen0-refresh-sidecar.
• Sync spine 4183/4184 footnotes in README + self-host docs (ci-fast WAVE3_ROADMAP_SYNC_GATE auto-heal).

Advances self-host M5 fast gate hygiene (#1492, continuous-work ladder step 4).

Root cause

check-selfhost-spine-sidecar-sync failed: stamp d8ba2365… ≠ spine SHA a8726034… after spine grew without sidecar stamp refresh.

Verification

php script/check-selfhost-spine-sidecar-sync.php
# check-selfhost-spine-sidecar-sync: OK (stamp matches spine entry SHA-1 a8726034f20531c2b0b53f4ea793191b89f0f04d)

php script/check-wave3-roadmap-sync.php
# check-wave3-roadmap-sync: OK (language open 0, stdlib open 0, spine 4183/4184)

php script/bootstrap-inventory.php --check
# OK 4184/4184

make bootstrap-selfhost-vm-driver-execute-probe
# bootstrap-selfhost-vm-driver-execute-probe: OK .../build/selfhost-lib-spine-smoke

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