feat(gsh): ShellTier T0-T6 + LMDB session enrichment + GSH_SHELL_TIER
ShellTier enum (T0-T6) with tree hierarchy, satisfies(), from_shell_class()
backward compat mapping. Exported as GSH_SHELL_TIER alongside GSH_SHELL_CLASS.
SessionState carries shell_tier derived from AC shell_tier field, GSH_SHELL_TIER
env, or shell_class mapping. Prompt shows tier: [governed] T2:tking@gsh.
Optional LMDB enrichment (behind `lmdb` feature flag): reads earned credentials
and identity class from substrate-identity-store, displays in banner.
16 shell_tier tests, 3 LMDB enrichment tests, 3 governance_env tests.
66 tests without lmdb, 69 with --features lmdb.
Signed-off-by: Tyler J King <tking@guildhouse.dev>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Tyler J King <tking@guildhouse.dev>
Tyler J King
a97e9569d6