feat(db-postgres): initial implementation — pgx pool with lifecycle and UnitOfWork (v1.0.0)

Introduces code.nochebuena.dev/einherjar/db-postgres — the PostgreSQL database
starter for the Einherjar framework. Absorbs the postgres package from micro-lib,
replacing fmt.Errorf wrapping with core/xerrors and migrating from pgx v4 to pgx v5.

Interfaces (CT-6: one TypeSpec per file):
- Executor — Exec, Query, QueryRow (pgx-native types)
- Tx — Executor + Commit(ctx), Rollback(ctx)
- Provider — GetExecutor, Begin, BeginTx, Ping, HandleError
- Component — lifecycle.Component + observability.Checkable + Provider + Stats()
- UnitOfWork — Do(ctx, fn)

Implementation:
- New(logger, cfg) Component — pool not created until OnInit
- OnInit: pgxpool.NewWithConfig with duration parsing; 30s timeout
- OnStart: PING with 5s timeout; logs "postgres: connected"
- OnStop: pool.Close(); logs "postgres: closing pool"
- GetExecutor: returns active Tx from context (ctxTxKey) or pool; nil-safe
- Begin/BeginTx: wraps pgx.TxOptions; wrapped in xerrors on error
- HealthCheck: delegates to Ping; Priority LevelCritical
- Stats() *pgxpool.Stat — zero value when pool uninitialized
- NewUnitOfWork(logger, provider) UnitOfWork — Begin+inject+commit/rollback
- HandleError: UniqueViolation→ErrAlreadyExists, ForeignKey/Check→ErrInvalidInput,
  pgx.ErrNoRows→ErrNotFound, all others→ErrInternal

Config (EINHERJAR_PG_* env vars):
  Host, Port(5432), User, Password, Name, SSLMode(disable), Timezone(UTC),
  MaxConns(5), MinConns(2), MaxConnLifetime(1h), MaxConnIdleTime(30m),
  HealthCheckPeriod(1m)

- Component interface embeds observability.Identifiable; identifiable.go implements
  ModulePath and ModuleVersion via runtime/debug.ReadBuildInfo() — prints in launcher banner

.gitignore

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+# ── Release workflow helpers ──────────────────────────────────────────────────
+COMMIT.md
+PR.md
+RELEASE.md
+
+# ── Go build artifacts ────────────────────────────────────────────────────────
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+/dist/
+/bin/
+
+# ── Go workspace (local development only) ────────────────────────────────────
+go.work
+go.work.sum
+
+# ── Dependency vendor directory ───────────────────────────────────────────────
+vendor/
+
+# ── Coverage output ───────────────────────────────────────────────────────────
+coverage.out
+coverage.html
+*.coverprofile
+
+# ── OS artifacts ─────────────────────────────────────────────────────────────
+.DS_Store
+Thumbs.db
+
+# ── Editor artifacts ──────────────────────────────────────────────────────────
+.idea/
+.vscode/
+*.swp
+*.swo
+*~