feat(boot,vfs,security): expand kernel boot contract, VFS snapshots, and ctx surfaces
- Kernel: strict capability contract merge, junit selftest, startup class, cold boot
budget warning, boot txn schema v1, rc/kernel.ext resolution traces, richer
bareOsPublishBootReady (steps/bootSteps, FSM sketch)
- Booter: warm reboot extra cycles, boot provenance on boot.json, step mirroring,
corestore/swarm suspend-resume hooks, swarm connection manager sketch, event bus
+ optional NDJSON, security_posture proc schema v2, key handle TTL/scopes
- VFS: snapshot path class + BARE_OS_VFS_SNAPSHOTS checkout views, policy metrics,
batch put + diff helpers, watch consistency hint, quotas vfsQuota fields
- Protocol: BARE_OS_PROTOMUX_CORK_HINT_VERSION via channel exports
- Initd: BARE_INITD_UNIT_STATES; shell: tokenizer module split
- Extensions: capability conflict detector in kernel-extension-resolver
- Docs/scripts: reference index map, observability event bus, dry-run vs rollback
table, benchmark trend + integration-lab smoke, scripts README
- Tests: /proc listing + pseudo path caps for snapshots and security_posture