Meta: Spinel Date runtime, Campfire gate, Writebook emit ledger

[thomasklemm]

Umbrella Spinel PR. Supersedes and continues #423 (cannot push to eddygarcas:spinel-date-runtime from this agent; please close #423 in favor of this branch, or cherry-pick).

Refs #303. Coordinates with #451 (IR/YJIT meta) — this PR does not fight Relation/alloc work unless needed for Spinel compile.

Landed

Date / Spinel (from #423 + follow-ups)

• Bounded program-defined Date for Spinel (runtime/spinel/date.rb), ISO SQL seams, JSON serialization, emit-and-run suite date_columns_spinel.
• Campfire fix: only emit/load Date when app_uses_date (schema date columns or date values in emitted roots). Unconditional Date#strftime breaks poly Time|Date dispatch (matz/spinel#7334); Campfire has no t.date and must not load it.
• format_db_date("") → nil; SqliteAdapter.escape_value(Date) → YYYY-MM-DD; inspect / xmlschema on Date.
• CI: framework-tests-spinel downloads real-blog-fixture for date_columns_spinel; ci-plan owns serialization file.

Campfire

• Verified emit omits runtime/date.rb and boot require under this branch (fixes the Add bounded Date runtime for Spinel #423 Campfire 500s from Date load).

Writebook

• Survey emit to Spinel succeeds (898 files) under --survey --allow-unsupported.
• Native AOT currently fails at emitted Positionable#move_to_position (each.with_index / Array append sharing — Spinel subset). Honest ledger of remaining blockers (has_markdown, delegated_type, keyword rest, ingest gaps) continues on this PR.

Still open / ledger

• ActiveSupport date extensions, form date helpers, schema Date.current defaults, require "date" (Spinel stdlib refusal).
• JRuby/Roda/other targets: separate runtimes required (Since #294 a single date column stops the spinel emit, and --allow-unsupported does not write the tree as the error says #303 comment).
• Writebook: has_markdown / ActionText::Markdown, delegated_type, keyword-rest helpers, md.erb views — not claimed.
• Spinel #7334 upstream: once fixed, Date can load unconditionally again.

Verification

• cargo test --locked --test date_columns — 11 passed (includes omit-Date-when-unused).
• Writebook/Campfire emit surveys recorded under agent artifacts.
• Please run advisory Spinel CI (ci:full) including campfire-compare-spinel and date_columns_spinel.

Commits (stacked)

1. Add bounded Date runtime for Spinel (from Add bounded Date runtime for Spinel #423, rebased)
2. Gate Spinel Date load; harden date seams for Since #294 a single date column stops the spinel emit, and --allow-unsupported does not write the tree as the error says #303

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[thomasklemm]

Closed in favor of consolidating Spinel dates + Writebook/Campfire Spinel work onto the existing meta PR #451 (user preference: one meta-PR; CI stays separate).