**High-Impact Revisions (ordered by priority)**

1. **Make service identity project-scoped (avoid collisions across repos/users)**
Analysis: Current fixed names (`com.gitlore.sync`, `LoreSync`, `lore-sync.timer`) will collide when users run multiple gitlore workspaces. This causes silent overwrites and broken uninstall/status behavior.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ Commands & User Journeys / install
- lore service install [--interval 30m] [--profile balanced] [--token-source env-file]
+ lore service install [--interval 30m] [--profile balanced] [--token-source auto] [--name <optional>]
@@ Install Manifest Schema
+    /// Stable per-install identity (default derived from project root hash)
+    pub service_id: String,
@@ Platform Backends
- Label: com.gitlore.sync
+ Label: com.gitlore.sync.{service_id}
- Task name: LoreSync
+ Task name: LoreSync-{service_id}
- ~/.config/systemd/user/lore-sync.service
+ ~/.config/systemd/user/lore-sync-{service_id}.service
```

2. **Replace token model with secure per-OS defaults**
Analysis: The current “env-file default” is not actually secure on macOS launchd (token still ends up in plist). On Windows, assumptions about inherited environment are fragile. Use OS-native secure stores by default and keep `embedded` as explicit opt-in only.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ Token storage strategies
-| env-file (default) | ...
+| auto (default) | macOS: Keychain, Linux: env-file (0600), Windows: Credential Manager |
+| env-file | Linux/systemd only |
 | embedded | ... explicit warning ...
@@ macOS launchd section
- env-file strategy stores canonical token in service-env but embeds token in plist
+ default strategy is Keychain lookup at runtime; no token persisted in plist
+ env-file is not offered on macOS
@@ Windows schtasks section
- token must be in user's system environment
+ default strategy stores token in Windows Credential Manager and injects at runtime
```

3. **Version and atomically persist manifest/status**
Analysis: `Option<Self>` on read hides corruption, and non-atomic writes risk truncated JSON on crashes. This will create false “not installed” and scheduler confusion.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ Install Manifest Schema
+    pub schema_version: u32, // start at 1
+    pub updated_at_iso: String,
@@ Status File Schema
+    pub schema_version: u32, // start at 1
+    pub updated_at_iso: String,
@@ Read/Write
- read(path) -> Option<Self>
+ read(path) -> Result<Option<Self>, LoreError>
- write(...) -> std::io::Result<()>
+ write_atomic(...) -> std::io::Result<()> // tmp file + fsync + rename
```

4. **Persist `next_retry_at_ms` instead of recomputing jitter**
Analysis: Deterministic jitter from timestamp modulo is predictable and can herd retries. Persisting `next_retry_at_ms` at failure time makes status accurate, stable, and cheap to compute.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ SyncStatusFile
     pub consecutive_failures: u32,
+    pub next_retry_at_ms: Option<i64>,
@@ Backoff Logic
- compute backoff from last_run.timestamp_ms and deterministic jitter each read
+ compute backoff once on failure, store next_retry_at_ms, read-only comparison afterward
+ jitter algorithm: full jitter in [0, cap], injectable RNG for tests
```

5. **Add circuit breaker for repeated transient failures**
Analysis: Infinite transient retries can run forever on systemic failures (DB corruption, bad network policy). After N transient failures, pause with actionable reason.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ Scheduler states
- backoff — transient failures, waiting to retry
+ backoff — transient failures, waiting to retry
+ paused — permanent error OR circuit breaker tripped after N transient failures
@@ Service run flow
- On transient failure: increment failures, compute backoff
+ On transient failure: increment failures, compute backoff, if failures >= max_transient_failures -> pause
```

6. **Stage-aware outcome policy (core freshness over all-or-nothing)**
Analysis: Failing embeddings/docs should not block issues/MRs freshness. Split stage outcomes and only treat core stages as hard-fail by default. This improves reliability and practical usefulness.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ Context
- lore sync runs a 4-stage pipeline ... treated as one run result
+ lore service run records per-stage outcomes (issues, mrs, docs, embeddings)
@@ Status File Schema
+    pub stage_results: Vec<StageResult>,
@@ service run flow
- Execute sync pipeline with flags derived from profile
+ Execute stage-by-stage and classify severity:
+   - critical: issues, mrs
+   - optional: docs, embeddings
+ optional stage failures mark run as degraded, not failed
```

7. **Replace cfg free-function backend with trait-based backend**
Analysis: Current backend API is hard to test end-to-end without real OS commands. A `SchedulerBackend` trait enables deterministic integration tests and cleaner architecture.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ Platform Backends / Architecture
- exports free functions dispatched via #[cfg]
+ define trait SchedulerBackend { install, uninstall, state, file_paths, next_run }
+ provide LaunchdBackend, SystemdBackend, SchtasksBackend implementations
+ include FakeBackend for integration tests
```

8. **Harden platform units and detect scheduler prerequisites**
Analysis: systemd user timers often fail silently without user manager/linger; launchd context can be wrong in headless sessions. Add explicit diagnostics and unit hardening.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ Linux systemd unit
 [Service]
 Type=oneshot
 ExecStart=...
+TimeoutStartSec=900
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=read-only
@@ Linux install/status
+ detect user manager availability and linger state; surface warning/action
@@ macOS install/status
+ detect non-GUI bootstrap context and return actionable error
```

9. **Add operational commands: `trigger`, `doctor`, and non-interactive log tail**
Analysis: `logs` opening an editor is weak for automation and incident response. Operators need a preflight and immediate controlled run.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ ServiceCommand
+ Trigger, // run one attempt through service policy now
+ Doctor,  // validate scheduler, token, paths, permissions
@@ logs
- opens editor
+ supports --tail <n> and --follow in human mode
+ robot mode can return last_n lines optionally
```

10. **Fix plan inconsistencies and edge-case correctness**
Analysis: There are internal mismatches that will cause implementation drift.  
Diff:
```diff
--- a/plan.md
+++ b/plan.md
@@ Interval Parsing
- supports 's' suffix
+ remove 's' suffix (acceptance only allows 5m..24h)
@@ uninstall acceptance
- removes ALL service files only
+ explicitly also remove service-manifest and service-env (status/logs retained)
@@ SyncStatusFile schema
- pub last_run: SyncRunRecord
+ pub last_run: Option<SyncRunRecord> // matches idle/no runs state
```

---

**Recommended Architecture Upgrade Summary**

The strongest improvement set is: **(1) project-scoped IDs, (2) secure token defaults, (3) atomic/versioned state, (4) persisted retry schedule + circuit breaker, (5) stage-aware outcomes**. That combination materially improves correctness, multi-repo safety, security, operability, and real-world reliability without changing your core manual-vs-scheduled separation principle.