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refactor(bb_http): size route table from explicit pre-start declarations (#340)

- replace the drift-prone .order route-count hints + SLACK fudge with exact pre-start bb_http_reserve_routes() declarations; fixes a latent bb_ota_validator undercount (declared 1, registered 3) that only BB_HTTP_OVERHEAD_SLACK was masking; delete bb_registry_route_count_total(); add strict registry-cap assert; correct bb_prov over-reserve post-asset-wildcard and self-trigger the pre_http walk to close the prov ordering gap.
- new sizing: max_uri_handlers = s_reserved_routes + BB_HTTP_EXPLICIT_PREFLIGHT(1) + BB_HTTP_EXPLICIT_ASSET_WILDCARD(1), floored to BB_HTTP_MAX_URI_HANDLERS_MIN(32)
- every breadboard component that registers live httpd routes now ships a BB_REGISTRY_REGISTER_PRE_HTTP companion that calls bb_http_reserve_routes(N) with its exact count
- bb_board registry entry removed (registers zero routes)
- bb_registry_init() audits route registry count post-walk; panics on overflow (CONFIG_BB_HTTP_ROUTE_REGISTRY_STRICT, default y) and warns at count >= CAP-8
- .order field on BB_REGISTRY_REGISTER_N is now documented as sort-key-only
- delete test_bb_registry_route_count_total_* host tests (removed function)
- add test_reserve_declared_total_from_companions regression test

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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