Syncular 0.29.0

0.29.0 is a minor release: SYQL accepts a new statement shape and typegen
changes the SQL it emits for every FTS join, so a patch number would hide the
surface. SSP2 stays at wire version 3, the server does not change, and every
package and crate ships together. Regenerate queries to pick up both changes.

• FTS joins read source ids through the mapping table
  (SYNCULAR-FTS-SOURCE-ID-001). A query that read
  fts._syncular_source_id made FTS5 fetch the content row of every match.
  Typegen now joins each FTS relation that FROM or an inner JOIN
  introduces to _syncular_fts_<projection> on the projection rowid and reads
  source_id there (SYQL §15). The authored SQL keeps its types, identity, and
  coverage; SQLite prepares the lowered statement and must return the same
  result names. SPEC now names the mapping table both client cores already
  kept. The bytecode of the lowered form carries no read of the projection's
  source-id column, and on 50,000 matches it took 53.9 ms against 73.6 ms
  (Bun 1.4.0, macOS arm64). The conformance scenario
  observation/fts-source-id-mapping pins the mapping invariant, identical
  rows, and the absent column read on both cores.
• Bounded ranked top-N (SYNCULAR-SYQL-TOPN-001). A top-level CTE body may
  end in LIMIT <n> when its identity is proven and its ORDER BY ends with
  that identity; any other nested LIMIT still fails with
  SYQL6003_NONDETERMINISTIC_SQL (SYQL §14.3). The total order makes the kept
  rows a function of the database state. §14.3 now names the cost of the
  unbounded MATERIALIZED form: it sorts every candidate and measured about
  30 % slower than the plain form on narrow rows.

Upgrade notes. Regenerate queries. Code that read analysis.sql or a
statement's sql from typegen output sees the lowered FTS join; the authored
text stays in sourceSql.