Bump to 6.29.2 and add the CHANGELOG entries for the release

[jeremydmiller]

Fix release. Four changes since 6.29.1, three of them reported bugs.

#3984	GH-516 parity for HTTP — a Before method that accepts the request type and returns it now replaces an immutable request body, as it has on the handler side since GH-516
#3993	GH-3986 — ClearAllAsync could not delete node records another process wrote
#3994	GH-3970 — an agent a node cannot build is released to a node that can
#3995	GH-3971 — the orphaned-message sweep is indexable, bounded, and out of the shared recovery transaction

Worth calling out

RavenDB users could not start in Solo mode after a Balanced-mode run — ClearAllAsync threw on every stale node record, because it deleted by tracked entity from a session that had not loaded it. The documented workaround (clearing WolverineNodes by hand in RavenDB Studio) is no longer needed.

SQLite silently orphaned every agent assignment row. Found by the compliance coverage written for the RavenDB fix — NodePersistenceCompliance had never exercised ClearAllAsync at all, which is how two providers shipped it broken. It does now.

The orphan sweep ships a new partial index on owner_id, so PostgreSQL and Sql Server users will see one index applied on the next schema migration.

The orphan sweep did not work on Oracle, and CI caught it before release rather than after. Both of its reads are node numbers read via GetFieldValueAsync<int>(), and Oracle's NUMBER arrives from ODP.NET as Int64 — and because both reads sit inside the try/catch that logs and returns, the whole sweep degraded to a silent no-op that released nothing while looking healthy. Fixed in #3995 before merge; no released version ever carried the broken form, since the sweep is new in this version.

Mechanics

• <Version> in Directory.Build.props: 6.29.1 → 6.29.2
• CHANGELOG entries added under the existing ## Unreleased heading, per this repo's convention
• Full wolverine.slnx builds clean at -f net9.0

After merge: tag V6.29.2, GitHub release, then dispatch publish_nugets.yml against main.

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