Add credential sharing openspec

docs/credential-sharing.md

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+# Credential Sharing OpenSpec
+
+Status: coming soon
+
+Slug: `credential-sharing`
+
+Credential Sharing is a LogicSRC OpenSpec for portable, auditable secret synchronization across local files and infrastructure providers. It is intended to replace closed, proprietary credential-sharing workflows with a provider-neutral contract.
+
+LogicSRC defines the open objects, CLI commands, SDK calls, TUI states, PWA states, provider adapter capabilities, and audit records. External products may consume this contract, but LogicSRC does not call out to product-specific commands.
+
+## First Providers
+
+```txt
+env
+doppler
+railway
+github-secrets
+```
+
+- `.env`: read, diff, redact, and write local environment files.
+- Doppler: sync project/config scoped secrets.
+- Railway: sync service variables.
+- GitHub Secrets: sync repository, organization, and environment secrets.
+
+## Core Objects
+
+```txt
+credential_provider
+credential_source
+credential_target
+credential_key
+credential_fingerprint
+credential_policy
+credential_diff
+credential_sync_plan
+credential_sync_run
+credential_approval
+credential_rollback
+credential_audit_event
+```
+
+## CLI Spec
+
+Command namespace:
+
+```bash
+logicsrc credentials <command>
+```
+
+Required commands:
+
+```txt
+providers
+inspect
+plan
+diff
+approve
+sync
+rollback
+audit
+export
+```
+
+Examples:
+
+```bash
+logicsrc credentials providers
+logicsrc credentials plan --from env --to railway
+logicsrc credentials plan --from doppler --to github-secrets
+logicsrc credentials diff --from env --to doppler --redact
+logicsrc credentials sync --plan cred_plan_123 --approve
+logicsrc credentials audit --run cred_run_123 --format markdown
+```
+
+## Security Rules
+
+- Raw secret values must never be printed by default.
+- Audit logs should store key names, targets, timestamps, actor identity, and value fingerprints, not raw values.
+- Every write operation should support dry-run mode.
+- Provider adapters must declare read/write capabilities before a plan is generated.
+- Destructive changes require explicit approval.
+- Rollbacks must be represented as new sync plans rather than hidden mutation history.
+
+## SDK Spec
+
+All SDKs should expose the same conceptual API:
+
+```txt
+listCredentialProviders()
+inspectCredentialSource(source)
+createCredentialSyncPlan(input)
+diffCredentialTargets(planId)
+approveCredentialSync(planId, approval)
+runCredentialSync(planId)
+rollbackCredentialSync(runId)
+exportCredentialAudit(runId)
+```
+
+## Provider Adapter Contract
+
+Provider adapters implement the LogicSRC credential provider contract:
+
+```txt
+provider.id
+provider.capabilities
+provider.auth_requirements
+provider.inspect()
+provider.diff()
+provider.write()
+provider.rollback()
+provider.audit()
+```
+
+The adapter boundary lets tools such as a PWA, TUI, CI workflow, or external CLI consume the same open standard without making LogicSRC depend on any specific product.