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trakhimenok 
docs(spec): add Approved Feature — concurrency-capability

Promotes the Approved Idea `concurrency-capability` to a Feature
spec at `spec/features/concurrency-capability/`.

The Feature pins a single capability — `dal.ConcurrencyAware` with
one method `SupportsConcurrentConnections() bool` — and embeds it
into the existing `dal.DB` interface alongside `TransactionCoordinator`
and `ReadSession`. This is a deliberate pivot from the Idea's
original "opt-in via type assertion" direction: every `DB`
implementation has a concurrency answer to give, "unknown" is a
fake state, and embedding matches dalgo's existing capability
composition pattern.

Ships:
- `dal.ConcurrencyAware` interface
- `dal.NoConcurrency` and `dal.ConcurrencyAvailable` reusable
  embeddable structs (zero method body at driver site)
- `dal.DB` interface gains the embedded capability
- godoc covering contract, stability guarantee, intentional absence
  of read/write asymmetry, and the embed-helper pattern
- in-package Go tests against mock DB types

Out of scope (driver repos pick up adoption):
- dalgo2sql (SQLite → false, PostgreSQL → true)
- dalgo2ingitdb (false until stress-tested)

Source Idea updated in lockstep: Recommended Direction reflects the
embed decision; one Should-be-true assumption is now Invalidated;
all four original Open Questions resolved at promotion.

Reviewer subagent: Approved (two advisory wording tightenings
applied to lifetime semantics and the AC for embedded-interface
verification).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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