fix(wake): #912 exercise the digest/HMAC trust suite in real CI

Make the wake digest/HMAC suite RUN and PASS in the real Woodpecker CI
runner (Alpine/musl, root), then hard-require the HMAC legs in CI.

Root cause of the runner-only D1/D4/D5/D6 failures (a masked-local run
passed, so it was runner-specific): a TOOLCHAIN divergence, not locale or
root. digest.sh's _scrub_ctrl used GNU-sed `\xNN` hex-escape byte matching.
The CI runner is node:24-alpine, whose sed is BusyBox — BusyBox sed REJECTS
a `\xNN` character range ("bad regex ... Invalid character range"), aborting
the whole scrub sed and silently VOIDING the scrub. Every scrubbed value
collapsed to empty, cascading into D1 (blank locators), D4 (no scrub/redact,
SHA blanked), D5 (blank agent prefix), D6 (blank [digest] class). Confirmed
by reproducing the exact 9-assertion failure in the ci-base image as root.

Fix (at the correct layer — a wake digest must render identically on any
runner):
- digest.sh _scrub_ctrl: patterns are now LITERAL bytes (printf %b), matching
  byte-identically under GNU sed (glibc dev) and BusyBox sed (Alpine CI).
  Verified identical output on both. Contract preserved: two-tier trust,
  exit-4 hard-locator FAIL-LOUD, secret-scrub, and 40-hex SHA preservation
  all unchanged — deterministic, not weakened.
- test-wake-digest-hmac.sh D4: replaced PCRE `grep -qP` (BusyBox grep has no
  -P; the `&&` silently skipped the check in CI) with portable literal-byte
  `grep -E` ranges (two disjoint bidi/zero-width ranges, excluding legit
  U+2014 em-dash).

CI enablement:
- Dockerfile.ci + .woodpecker/ci.yml test step: add openssl (the non-circular
  HMAC signer) so H1/H2, beacon B12, install I8 can run. The apk add in the
  test step covers PR pipelines before ci-base rebuilds.
- Flip the 3 openssl skip-guards (digest whole-file, beacon B12, install I8)
  to HARD-REQUIRE openssl when CI is set (Woodpecker CI=woodpecker) and FAIL
  loud if absent; KEEP the skip for openssl-less local dev.
- manifest.txt: wake 0.6.2 -> 0.6.3 (digest.sh scrub portability; precedent).

Red-first verified in the ci-base container (root): D4 catches a broken
redaction, H1 catches a tamper that doesn't break the MAC, B12/I8 catch a
corrupted signer.

Closes #912
Part of #892

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0158NZqN2n2ymKFeJAZ4GUCb

Dockerfile.ci

@@ -25,7 +25,10 @@ FROM node:24-alpine
 # postgresql-client used by the test step's pg_isready readiness probe. `bash`,
 # `git`, and `jq` are baked here too — framework shell tests and the shipped
 # Codex review wrappers require them without per-run installation in ci.yml.
-RUN apk add --no-cache python3 make g++ postgresql-client bash git jq
+# `openssl` (#912) is the non-circular HMAC signer for the wake trust layer:
+# the digest H1/H2, beacon B12, and install I8 legs hard-require it in CI so the
+# §4 G6 evidence comes from an actually-run HMAC leg, not a skipped one.
+RUN apk add --no-cache python3 make g++ postgresql-client bash git jq openssl
 
 # Pin pnpm to the repo's packageManager version via corepack.
 RUN corepack enable && corepack prepare pnpm@10.6.2 --activate