Review follow-up on #94701: the delegation tool's _initialize_schema
still carried its own CREATE TABLE + ALTER column list for
async_delegations, leaving a second durable-shape authority even with
the column declared in SCHEMA_SQL. Its legacy ALTER added
origin_session_id as bare TEXT (nullable, no default); reconciliation
repairs missing column names only, so a database first opened through
the tool kept a non-canonical shape forever (#94691).
Remove the private DDL entirely. The tool's initializer now calls a new
reconcile_state_schema() in hermes_state_schema, which replays the
canonical SCHEMA_SQL (idempotent CREATE IF NOT EXISTS for every table,
canonical indexes included) and reuses SessionDB's declarative
_reconcile_columns for missing-column backfill — one reconciliation
implementation, one authority. Because _parse_schema_columns
reconstructs each column's full constraint expression (type, NOT NULL,
DEFAULT), the tool-first legacy path now adds origin_session_id as
TEXT NOT NULL DEFAULT '' — the canonical shape — and SQLite backfills
existing rows with the '' default.
Opening-order regressions compare FULL PRAGMA table_info metadata
(type, notnull, dflt_value, pk) plus the canonical index set across
fresh SessionDB→tool, legacy→SessionDB, and legacy→tool→SessionDB,
each preserving a pre-existing legacy delegation row.
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